Tablet_FnKey is anther application coming from TodoUMPC team member Angel Garcia:
Tablet_FnKey is an utility which allows to enable the assignation of alternative actions to the Tablet PC buttons when they are pressed in combination with a “function button” known as FnKey. This is a feature, not always enabled, supported by all the Tablet PC and UMPC devices which uses the system’s standard method to manage the use of the buttons, but not all the devices uses such method. For example among the UMPC devices AMtek T700 uses this standard method while Samsung Q1 doesn’t. The utility works on Windows XP TabletPC Edition as well as on Windows Vista.
You can find the link to download this application at the bottom of this post in Spanish. The application and readme files are in English.