The PC emits no sound.
ProblemThe PC emits no sound.
CauseThe PC will emit no sound in the following cases:
- TwomonAir -> Menu -> Sound is not set to ON.
- The audio channel is set for 5.1 channels or more.
- The default replay device in Control Panel in Windows is not set to ‘Speakers’.
- The speaker in the MAC is not set to ‘SoundFlower’.
Set the sound function of TwomonAir to ON
Click ‘Sound ON’ in the menu window of TwomonAir.
Change the 5.1 or more sound channels to 2 channels
Change the audio channel to 2 channels if it is set to 5.1 or more channels.
Change the default device in Speaker > 'Replay device'
1. Right click the speaker icon in the task bar tray of Windows.
2. Select ‘Replay device’ in the menu.
3. Set ‘Speakers’ as the default device in the replay device list.
Change the 5.1 or more sound channels to 2 channels
Change the audio channel to 2 channels if it is set to 5.1 or more channels.
Change the sound setting (output device) to ‘SoundFlower(2ch)’
Right click the speaker icon in the task bar tray at the top of Desktop.
Select ‘SoundFlower(2ch)’ in the output device list.
I cannot properly delete the PC program
ProblemI cannot properly delete the PC program.
CauseIn certain cases it may be difficult to delete the PC program properly.
TroubleshootingYou can solve the problem using the "Microsoft Fix It" program.
Refer to the Microsoft Fix It Manual for more detailed information.
※Microsoft Guide: https://support.microsoft.com/us-en/mats/program_install_and_uninstall
Can I use both TwomonAir and TwomonUSB with the PC program?
QuestionCan I use both TwomonAir and TwomonUSB with the PC program?
AnswerYes, you can use both TwomonAir and TwomonUSB with the PC program.
The Twomon PC program is an integrated program that supports both TwomonAir and TwomonUSB.
However, you have to purchase TwomonAir and TwomonUSB separately.
The driver is not properly installed in the PC program . code 10, 28, 31, 37, 43
ProblemIf the driver is not properly installed in the Twomon PC program, the virtual expansion screen will not be available and/or the touch input from the connected screen might be inoperable.
CauseThe driver may not be installed or function properly in the PC program for the following reasons:
- The system was not rebooted after installation of the PC program.
- The driver installation failed.
- There is an NVIDA graphic card supporting Optimus technology in the PC.
※ As the Windows 7 Starter edition does not support the extended function, the WDDM display driver cannot be
installed and the extended function of Twomon cannot be used.
Checking the driver in 'Device Manager.'
1. Press the Windows key + the R key and enter devmgmt.msc in the input box.
2. Select View > Device (for each connection) (V) in the menu to align the drivers and confirm the Devguru Twomon virtual bus and sub-drivers.
Device Manager Screen of Windows XP and Vista
Device Manager screen in Windows 7 or higher.
Double click the driver in the Device manager and check the error code of the driver in the ‘General’ tab.
TroubleshootingThis section is based on the Devguru Twomon WDDM display adapter, but is also applicable to the Devguru Twomon Virtual Bus driver
and the Devguru Virtual HID-compliant mouse (AP) driver.
Reboot the PC (error code 43).Reboot the PC after installing the driver and check if the driver causing the error code is operating properly.
Install the driver manually (error code 10, 28 and 31).[Windows]
Manual installation of the driver in Windows XP or Vista
If error code # 10 is generated by the Devguru Twomon XPDM display adapter, the driver can be manually installed again to solve the problem.
As the environment does not allow automatic installation, the driver must be manually installed each
time the Twomon PC program is upgraded.
Download the attached document and install the driver manually by following the following instructions:
Manual installation of Windows XP display driver.pdf
Manual installation of Windows Vista display driver.pdf
Installation of the driver in Windows 7 or higher
1. Open ‘Device Manager’.
2. Select View > Device (for each connection) (V) in the menu to align the drivers. Select the driver to reinstall,
right click the mouse, check “Delete the driver software of this device” and select the driver.
3. Click the ‘Scan for hardware changes’ icon in the icon bar to recognize the deleted device again.
4. Right click the recognized device and select ‘Update Driver Software’.
5. Select ‘Browse my computer for driver software’.
6. Click ‘Browse…’ below ‘Search for driver software in this location:’ and enter the path for Twomon PC program installation.
PC program installation path:
32bit C:Program FilesTwomon Windows Serverdriver
64bit C:Program Files (x86)Twomon Windows Serverdriver
7. Reboot the PC after installing the driver.
Change the NVIDIA driver supporting the Optimus technology to ‘Disable'’ (error code 37 and 43).If the PC program is installed in a PC equipped with an NVIDIA graphic card that supports Optimus technology,
error code 37 and 43 may be generated by the Devguru Twomon WDDM display adapter.
In that case, disable the Optimus function in BIOS or right click the NVIDA driver,
set the device to ‘not used’ and reboot the system to solve the problem.
The trackpad of notebook does not work when the PC program is installed
ProblemThe trackpad of the notebook does not work when the PC program is installed.
CauseThe virtual mouse driver used for touch input is installed when the Twomon PC program is installed. If the ‘Disable touchpad/pointer of an external USB mouse connected’ in the trackpad setting is checked, the trackpad will not work since the program regards the installed virtual mouse driver as a USB mouse.
Uncheck the ‘Disable touchpad/pointer if an external USB mouse is connected’ option in the trackpad setting[Windows]
Although the actual setting may differ depending on the manufacturer of the notebook PC or tablet PC,
uncheck the ‘Disable touchpad/pointer if an external USB mouse is connected’ option in the trackpad setting in order to use the trackpad.
The touch coordinate on the tablet PC is incorrect
ProblemThe touch coordinate on the tablet PC is incorrect.
CauseThe tablet PC must be set in Windows.
‘Tablet PC Setting’ in Windows[Windows]
Set the tablet PC in Windows using the following procedure.
1. Make sure that the TwomonUSB and the device are connected.
2. Go to Control panel > Hardware and sound > Tablet PC setting.
3. Go to Display > Configuration > Setting (S).
4. Follow the instructions on the screen.
The TwomonAir disconnects frequently.
QuestionWhat should I do when TwomonAir disconnects too frequently?
AnswerAs TwomonAir is connected through a wireless network, its performance can be improved if the mobile device is connected to the same network. Moreover, the ad hoc network is recommended if the PC and the mobile device are only a short distance apart. It should also be noted that the performance of TwomonAir can be improved in a network where a single device rather than multiple devices are connected.
Refer to the following link for connecting TwomonAir.
Connecting a PC with an app in another network
I cannot display a menu window in TwomonAir.
QuestionI cannot display a menu window in Twomon Air.
There are two ways to display the menu window in Twomon Air.
- Simultaneous three-finger touch
Bunch together three fingers and touch the center of the screen with them simultaneously.
- Selection of the Menu Window button in ‘Quick Menu’
The menu window can be displayed with ‘Quick Menu’.
‘Quick Menu’ can be enabled in the setting page of the Twomon app.
When ‘Quick Menu’ is enabled, the Quick Menu icon is displayed in the lower right corner.
What is the difference between TwomonAir and TwomonUSB?
QuestionWhat is the difference between TwomonAir and TwomonUSB?
AnswerBoth TwomonAir and TwomonUSB can expand the monitor screen. The difference is that TwomonAir is connected wirelessly while TwomonUSB is connected via a USB.
|Expansion||The function creates a virtual screen using a mobile device connected to a PC as a monitor.||O||O|
|Mirroring||The function displays and operates the output from the connected PC on the connected device.||O||O|
|Sound||This function outputs the sound emitted by the connected PC on the connected mobile device too||O||X|
|Utility||This is a calculator function.
※ It also includes a memo pad function for iPad.
|Touch Input||Tis function allows users to operate the connected PC by touching the screen of the mobile device.||3 touch modes supported
-Device touch mode
-PC touch mode
|1 touch mode supported
-Device touch mode
|Joystick||This function registers and uses the arrow keys, mouse right/left buttons, and four frequently used keys as shortcuts||O||X|
|Keyboard||This function displays the keyboard layout on the screen so that the user can touch the keys to input to the connected PC.
※ The Bluetooth keyboard is supported by iOS devices.
|2 input modes supported
-System keyboard (for iOS devices)
-Custom keyboard (for iOS and Android devices)
|Numeric Keypad||This function provides the numeric keypad function of a keyboard.||O||X|
|Screen Mode||This function optimizes the system performance by adjusting the CPU utilization rate or screen output speed.
※ TwomonAir can change the output display according to the mode to improve the performance.
|3 modes supported
|Google Connection||A user can log in with a Google account in a PC program or a TwomonAir app in an iOS device and run a remote connection through the Google server.
※ This function is supported only by iOS devices
Is it possible to use TwomonUSB while recharging the device?
QuestionTwomonUSB consumes the battery power of a mobile device. Is it possible to use TwomonUSB while recharging the device?
AnswerYou can connect the commercial high-speed USB recharging adapter or the rapid recharging utility software provided by the mainboard manufacturers.
Make sure the adapter is compatible with the operating PC environment before using the product.
Does TwomonUSB feature a sound function?
QuestionDoes TwomonUSB feature a sound function?(like TwomonAir does)
AnswerTwomonUSB provides only Expansion, Mirroring and Touch Input. It does not have a sound function.
The Windows Aero feature is disabled
QuestionThe Aero feature is disabled when the app is connected in Windows 7 or Vista.
AnswerBecause of certain technical issues, the Aero feature is disabled in Windows 7 and Vista.
Aero is available in Windows 8 or higher.
The web browser, game or Office program is not displayed correctly on the virtual screen
ProblemThe web browser, game or Office program is not displayed correctly on the virtual screen, or the screen turns blank when the game screen mode is changed to full screen mode.
CauseIs ‘Twomon Virtual Display’ in the Options of the PC program set to ON when Twomon is connected?
Some application programs are not displayed properly on the virtual screen because the Twomon display driver is S/W based and does not support the H/W graphic acceleration function.
Twomon configures the virtual expanded screen in the mode selected in ‘Twomon Virtual Display’ of the PC program.
1. Twomon virtual display OFF
The expanded screen is configured using the graphic driver provided by the system,
and is highly compatible with and can use the H/W acceleration function supported by the application program.
2. Twomon virtual display ON
The expanded screen is configured using the Devguru Twomon WDDM display driver provided by the PC program
and delivers superior performance to Twomon virtual display ON. However, as it does not support hardware graphic acceleration,
some application programs that use the function may not operate properly.
Disable the H/W acceleration function in the web browser.[Windows/Mac]
- Internet Explorer
Check ‘Use software rendering instead of GPU rendering*’ in Internet options > Advanced tab > Accelerated graphic.
Uncheck ‘Use hardware acceleration if possible’ in Chrome custom setting and control - Setting - Advanced setting and control
> Setting > Advanced setting display > System in the upper right corner of the browser
Set Twomon virtual display to OFF before the connection.※ The Twomon virtual display function is supported in Windows 7 or higher.
If Twomon virtual display is set to OFF, the virtual expansion screen can be configured with the system driver
to improve the screen display compatibility.
Disable the H/W graphic acceleration function in the application program.In an environment comprising dual or more monitors where Twomon virtual display is set to ON,
a display problem can be corrected by disabling the ‘Hardware graphic acceleration’ function in the application program option
causing the problem or by changing the ‘Full screen mode’ to ‘Window mode’
I cannot use the virtual extended screen
ProblemAfter Twomon is connected to the PC, the virtual extended screen will not be displayed in the app, and only the PC screen will be displayed. There is no virtual extended screen that can be selected in the menu.
CauseThe following may cause a failure to display the virtual extended screen or result in its unavailability.
- The virtual extended screen is configured, but the PC displayed is copied by the app.
- The position or resolution of the PC display is changed, and thus the virtual extended screen previously connected cannot be found.
- An error occurred from the Devguru Twomon WDDM/XPDM display adapter that configures the virtual extended screen
(error codes 10, 28, 31, 37 and 43).
- The OS is not supported, or the environment does not support Twomon.
Bring menu with three fingersThe extended screen can be simply selected from the app if it is configured in the PC.
You can just one-tap with three fingers on your device after connecting Twomon products.
Swipe and tap the display on TwomonUSB or choose 'Select Screen' menu on TwomonAir.
Enable 'Extend' mode on Display Settings or Uncheck 'Mirror Displays' on Displays after connecting Twomon
If you cannot select the extended display on Twomon, you can try to enable 'Extend' mode in Windows,
then you may try bring the menu after enabling this mode.
Connect Twomon products after enabling the Twomon Virtual DisplayNote: ‘Twomon virtual display’ is available only in Windows 7 or higher.
If the virtual extended screen is not created, you can solve the problem by changing ‘Twomon virtual display.’
Change ‘Twomon virtual display’ in the ‘Display setting’ menu of the Twomon PC program while Twomon is not connected
to the PC and then connect it to the app.
'Twomon virtual display' is a new function that has been added to increase the display compatibility of application
programs that use the virtual extended screen in Windows 7 or higher. It can select the driver for the virtual extended screen.
The benefit of using the virtual extended screen with ‘Twomon virtual display’ set to ON is that it supports higher resolution
and increases the screen output performance in Windows 7. However, there is a limitation in that the application program
that supports the hardware acceleration function may not work properly.
The benefit of using the virtual extended screen with ‘Twomon virtual display’ set to OFF is that it is highly compatible
with application programs that support the hardware acceleration function. The weak point is that the performance of the
virtual extended screen may be poor if the Twomon virtual display is set to ON under Windows 8 or higher.
The recommended environment for using the Twomon virtual display set to OFF is as follows:
1) The graphic card must support the virtual display when enabled;
2) a video port to enable virtual display must be available; and
3) the OS should be Windows 7 or higher.
Reinstall the Devguru Twomon WDDM/XPDM display adapter driverIf the virtual extended screen cannot be used while 'Twomon virtual display' is set to ON, check if the display driver is running properly.
If it is not, reinstall the driver manually and then connect the PC to the app in order to use the virtual extended screen.
Check if the environment supports TwomonTwomon cannot be used in Windows 7 Starter, in Windows installed through the boot camp, or in a virtual machine environment.
The resolution of the virtual extended screen cannot be changed
ProblemThe resolution of the virtual extended screen is fixed to 1280*720 and cannot be changed in the PC system.
CauseIf the resolution of the virtual extended screen configured with 'Twomon virtual display’ set to OFF cannot be changed,
the following may be the reason.
- The display driver that creates the virtual extended screen is not set to change the resolution.
Change the 'Twomon Virtual Display' to ON and connect.Note: 'Twomon virtual display' is available only in Windows 7 or higher.
Since the resolution can be changed from the Twomon virtual display driver, set ‘Twomon Virtual Display’ to ON in order to
change the resolution of the virtual extended display.
Set ‘Twomon virtual display’ in the display setting menu of the Twomon PC program to ON while Twomon
is not connected to the PC and then connect it to the app.
Upgrade the display driver of the graphic card to the latest version.The virtual extended screen is configured with the graphic card driver in the PC if the Twomon virtual display is set to OFF.
The resolution of the virtual extended screen can be changed if the display driver of the graphic card is upgraded to the latest version.
The PC and the app in the same network cannot be connected
ProblemThe list of PCs connectable to the app is not displayed.
CauseIf the PC and the device are not connected in the same network band or the Twomon PC program is not allowed by the firewall, the PC may not be displayed.
Connect the PC and the device in the same network band.[Windows/Mac]
Check if the PC and the device are connected through the same network.
Add the PC manually and connect it.[iOS/Android]
Add the IP address of the PC in the same network band manually to the app and connect it.
Set the firewall of the PC to allow the 'Twomon PC Program' for communication.[Windows/Mac]
Set the firewall of the PC to allow the 'Twomon PC Program' and rerun the PC program to connect TwomonAir.
Repeated failure of Google account login
Problem※ Login to a Google account is needed to use TwomonAir when connected to a different network.
Therefore, a TwomonUSB user does not need to login to the Google account. Moreover, the function is available only to users of TwomonAir connected to an iOS.
The following message is displayed after the failure of login to a Google account.
"Failed to log in to a Google account. The e-mail address or password is invalid. Please try again.”
CauseThe Google account may require 2-level password validation.
“App access with low security” may not be set in the Google account setting.
Using 2-level validation of Google passwordIf you use 2-level validation of a Google password, use the "application password" to use TwomonAir.
Please refer to “Logging in with an app password” in the Google Guide for more detailed information.
Google Guide: https://support.google.com/accounts/answer/185833?hl=en
Setting of the “App access with low security” option in Google accountFor security reasons, Google blocks access by an app with a low security level.
A user can specify "App access with low security" in order to use TwomonAir.
Refer to “Allow unsafe app accessing the account” in the Google Guide for more detailed information.
Google Guide: https://support.google.com/accounts/answer/6010255?hl=ko
Is there a demo version that I can try before purchasing the product?
QuestionIs there a demo version that I can try before purchasing the product?
AnswerBoth TwomonUSB and TwomonAir are paid apps available at App Store and Google Play. A demo version is not currently available.
How should I check the IP address of my PC?
QuestionHow should I check the IP address of my PC?
The following information can be checked ono the main page of the Twomon PC program.
- PC name
- IP address
- Time of Twomon connection
- Amount of data sent from the PC to the mobile device
* If two or more networks are connected to the PC, only the first IP address is displayed on the main page.
Connecting a PC and an app in another network
QuestionHow can an app in a mobile device be connected to a PC in another network?
Connect through the ad hoc network.The network can be used in an environment where there is no router. The mobile network adapter must be installed
since the ad hoc network is a mobile network.
※ This method is supported only by TwomonAir for iOS.
1. Ad hoc Network SettingSet the ad hoc network.
Ad hoc network setting between Windows computers (for Windows 7)
2. Network IP setting in the PC mobile network adapterSet the IP address in the mobile network adapter of the PC manually.
3. Ad hoc network IP setting in the deviceSelect the network set in the PC in Setting >Wi-Fi in the device and manually set the IP address and the subnet mask.
The PCs that are connectable from the app are listed on the screen.
VPN connectionSet the VPN to safely connect TwomonAir.
1. Check the public IP and PC IP connected to the router.Web page to consult to check the public IP: http://whatismyipaddress.com/
Check the internal IP of the PC connected to the router from ‘PC info’ on the main page of the Twomon PC program.
2. Set the VPN in the router.Set the VPN server in the way that is supported by the router’s manufacturer.
3. Set the VPN in the device.Set the VPN using the public PC in the device.
After setting up the DVN in the PC and the device, add the internal IP of the PC in ‘Favorite IP input’ on the main page of
the web to connect TwomonAir.
Setting up SuperDMZ (SDMZ) of router and connectionThis is a method of directly allocating a public IP to the PC connected to the router for connection.
After setting up SuperDMZ, add the public PC in ‘Favorite PC input’ on the main page of the app to connect it to TwomonAir.
Web page to check the public IP: http://whatismyipaddress.com/
※ The SuperDMZ function may have a different name depending on the router’s manufacturer.
Connection with a Good accountYou can connect a PC and the app Connection with a Google account from anywhere anytime. Input the Google account in
‘Google Account’ of the PC program and the app to simply use TwomonAir.
Unlike the same network connection, the performance is affected by the condition of the Google server or status
of the connected network since the data are exchanged through the Google server. When a mobile network is used,
the transfer speed or stability may be lower than the same network connection.
When using a mobile network, set TwomonAir > Setting > 'Allow mobile network' to ON first.
※ TwomonAir for Android can connect the PC and the device in different networks using the VPN and SuperDMZ.
Please use " Contact us " about unresolved questions.