Eliminating text

When I run a program and I get all my text up, is there a way to press a button and delete all the text and then make some more text come up?

thanks.
You mean as in clear the screen?
Yes. But I don't want to close the whole application, I just want all the text that is already there to disappear. Maybe by clicking a button.... I dont really know how to do it, but if there is a way, then i would like to know it.
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