How to deal with unresponsive Leopard?

Hello people,
I would like to know, as a mac newbie, what to do when Leopard stops responding. For example it happened a few times, when i had lots of apps open, to work with very big PDF, and i clicked cancel on that action and soon after the whole leopard stopped responding, including the Dock.
I moved the mouse on the acrobat reader app to force quit it and it zoomed the icon on the dock and as soon as i ctrl+clicked it it stopped responding. Mouse was still moving but everything was frozen.
Those moments can be such a pain, especially when using at the same time iwork which doesn't have autosave.
Andrei D

Hi, you can do the k/b shortcut:- OptionAppleEscape then choose Force Quit requirements.
How much Ram are you running?
After a Freeze" I usually Repair Permissions & Reboot..L

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