with a macbook pro it's easy. Just buy the right connector (like
http://store.apple.com/us/product/HA...13-ft?fnode=53 this for example) . Plug it in your laptop and hook it up on your second screen.
In the Systempreferences => Monitor, you can choose how you want to set it up.
You don't need to buy/install new software.
For a PowermacG5 i don't know how you could do it.
I guess buying a second videocard could do the trick.
I do know that with the iMacG5 it was only possible to use a second monitor as a 'mirror' for your native-one.
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