What's that button on top right corner?

New to Mac and OSX here, I'm still not sure about some of the most basic things.

On the top right corner of windows (not on all but most), there's a little button that one can click on, I have the follwing questions:

1. What is it supposed to do?

2. On some windows, clicking on it shrinks the window size, whereas on others it enlarges the current window. On some others, it doesn't do anything. And on Firefox, it hides the address bar. Is this normal?

3. Is there a keyboard shortcut key for that button so I won't have to click on it every time with a mouse?

Thanks in advance!

Macbook Intel Core Duo 2.0 GHz, Mac OS X (10.4.7), 2GB 667Mhz DDR2, 80GB SATA HD

Posted on Sep 13, 2006 8:10 PM

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3 replies

Sep 15, 2006 7:47 AM in response to macmeup

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What's that button on top right corner?

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