A push button switch algorithm inquiry?

Hello der!!!

Just a curiousity, What if I have a button-- when I press and hold it off course it will display a character corresponding to a keypress.

Is their an alogorithm when I press and hold the button it will only register one keypress for that specific button?

I need your comments, suggestions, sample snippets if any.

Thanx

Your post is a bit light on detail, but i'll offer the following. Assuming that you are using a microcontroller, you can easily craft software to only register one keypress when a button is held down. On one of my systems I use this feature. For instance, my board enters a debug mode if i hold the button longer than 3 seconds or so, but just operates normally otherwise.