In this MacFixIt forum, 'Rosyna' has identified a way to install and use the new Toast5 OS X preview release without quitting all applications and rebooting (which the installer will force you to do).
Check it out if you're a licensed Toast5 owner and want to save application quitting and a reboot prior to burning data CD-R's.
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20010718172047571