Screen poweroff with an ibook

[J. Volkmann]

Hello,

as I use my laptop in classes, I sometimes don't use it for 20 or more
Minutes. Is there a way to turn the screen off manually perhaps with a
key shortcut?

My laptop is an ibook2 with the radeon (2x USB, 700 MHz).

Another thing: Is the ibook able to do a hot-switch of batteries?

Thanks in advance,

Johannes

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