When I hooked up my brand new T272HL display this morning on my Windows 7 Enterprise 64-bit laptop, the touchscreen is recognized on the second monitor, a Dell 24" non-touch model. This same thing occurred when I hooked up an Acer T232 touchscreen as well.
I opened up the "Pen and Touch" settings, and clicked on the setup button. Screens turn white, and I press Enter until the text is on the Acer T272HL monitor. I tap the touchscreen and ... nothing. Tap it again, and the setup screens go away, but the touchscreen events still register on the Dell monitor, not the Acer. Note that this *worked* on the Acer T232 monitor.
The Acer T272HL is selected in the configuration combo box, but right below it it says "No Pen or Touch Available for this Display". The monitor shows up as "Generic PnP Monitor" in Device Manager. What gives?
I went to the Acer website to get a driver for the monitor, and after downloading it and unpacking it, the only two files are .HCKX files - Which are Windows 8 Hardware Compatibility submission files! I don't think these were intended to be posted as downloadable drivers on Acer's support page...