I have a convertible laptop / tablet, and for apps which don't use the new Win7 touch APIs there is, strangely, no simple solution.
Two ugly workarounds I've found :
- enabling the on-screen (overlaid + transparent) mouse, then clicking its button (urgh)
- sliding your finger a bit for each touch (I didn't try it in MAME, but worked in most other software). I think the trick is to send a drag-n-drop series of messages to the application, which is processed differently than a simple touch, and actually registers a click. Obviously not optimal for fast games (don't stab your finger through your new gadget !) but I have the biggest NDS to play Phoenix Wright on.
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