Configuring UPDD extended touch for multi monitor support in Windows Vista, 7 and 8


In these operating systems UPDD implements a feature known as “extended touch”. In this mode UPDD uses a virtual HID device interface to appear to Windows as a fully HID compliant device, regardless of the type of device actually attached. In 4.1.10 only one virtual HID device is installed, irrespective of the number of monitors connected to the system, so this only caters for one touch device working in extended touch mode. Starting with UPDD version 5.0.2 one such virtual HID interface is installed for each monitor detected.  By default the virtual HID device(s) are initially associated with the primary monitor so that any touches will result in cursor movement on the primary monitor. With multi monitor environments we had hoped to find a way to programmically assign each Virtual HID entry to the monitors defined on the system but unfortunately this was not possible, hence the need to perform these manual steps.


These notes describe how to associate a touch screen device with UPDD extended touch enabled (uses the virtual HID interface) for monitors other than the primary monitor such that touches on that monitor move the cursor on the correct extended desktop.  Therefore these notes only have to be followed when using a touch monitor on a Windows extended desktop (non primary monitor) and with the UPDD Extended touch setting enabled.


Setup Procedure

Install UPDD as normal and connect all monitors and touch devices. UPDD will create a Virtual HID entry per monitor found.

If required, the Device Manager can be used to ensure that the number of Virtual HID devices matches the number of monitors. This Windows 8 example shows two instances.



Here is a similar Windows 7 example



It may be necessary to wait a while for the entries to appear in the Device Manager.


Using the UPDD Console, each connected touch screen needs to be associated with the unique desktop monitor as follows.

In this example there are two touch screens:



Select the Windows monitor as required.



For the purpose of the Virtual HID monitor association it does not matter which monitor is chosen, so long as each device has a different monitor number. If you intend to switch between UPDD Extended Touch and Mouse interface then the correct monitor number should be selected at this stage. If it is not known then use the Configure All… option to make the monitor assignment.


Open the control panel and select the Tablet PC settings option.


On Windows 8 access the control panel by pressing the Windows key, type “control” as shown below and click “Control Panel”.



The control panel options from Windows 8 are shown below, Windows 7 is very similar.



Select the Display setting, then “Change display settings”, then Identify. The monitors will be identified thus:



Note the monitor layout.


Now select the Tablet PC Settings



On the Tablet PC settings screen above, run the following sequence for each touch screen display in turn:

1)      Click setup

2)      Press enter until this screen is displayed on the monitor number selected in the Display above.

3)      Now touch the monitor on which it is displayed two or three times until the text changes.

4)      Press enter to skip through any remaining screens until the window closes. 
Do not touch any further touch screens as the correct association between the selected monitor and touch screen will be lost

5)      Click OK

6)      Open the TABLET PC settings again to set up any further display/touch associations.