Usually an on-screen button must be clicked on to submit the search.

Two clicks on an on-screen button reorient the image.

Tiny electronic chirps play each time you tap an on-screen button.

Most of the on-screen buttons are big and bold enough to press with your fingers.

It measures the length of time between an action - clicking an on-screen button, for example - and when the resulting reaction occurs.

To hurry things along, you can remove each print yourself and click an on-screen button to tell the printer that you did.

To press on-screen buttons, you simply touch them.

An on-screen button will start the audio-preview function and play all of an artist's song excerpts in sequence.

For example, in the early 1990's, CompuServe allowed users to buy stock price graphs by pushing an on-screen button.

The number of on-screen buttons varies depending on what is being controlled at the time.