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There are a few setting you need to change for the external qwerty to work on the Touch Pro with the ICA client. Open the ICA Client from Programs.

This should lauch into the browser.

Select "Edit Global Settings"
Select "Edit Preferences"
Change "IME Settigns" to Disable Both
Check the "Send Hardware Button Input" box

You might be interested in playing with the "Enable Full Screen" box setting as well, but you'd want to change the session resoltion to 640x480 first via the client or Web Interface depending on how you're connecting.