Today I read a paper titled “Tap Tips: Lightweight Discovery of Touchscreen Targets”
The abstract is:
We describe tap tips, a technique for providing touch-screen target location hints.
Tap tips are lightweight in that they are non-modal, appear only when needed, require a minimal number of user gestures, and do not add to the standard touchscreen gesture vocabulary.
We discuss our implementation of tap tips in an electronic guidebook system and some usability test results.