Things to consider when writing for touch screen?

Question

I\'m starting a new project which involves developing an interface for a machine that measures wedge and roundness of lenses and stores the information in a database and reports

Answer 1

The most obvious thing is that everything on the GUI needs to be big enough for a fingertip to hit, which is sometimes bigger than you think.

As has been mentioned, there's really no way for a right-click action to happen. Also, double-clicking can be tricky with a fingertip on a touch screen.

The other major thing is that you'll want to create a on-screen keyboard that pops up for text entry and an on-screen numpad for number only fields.