Does anybody here use Desktop Manager? It's a really handy app to give you multiple desktops in OS X. Anyway, I've found that when you switch from a desktop with an open app to an empty one, and you move the mouse around a bit, the cursor changes just as if it were moving over the window. It's pretty neat seeing hyperlinks appear out of nowhere
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PPC Macs:

• Power Macintosh G4
  
• B&W Power Macintosh G4
  
• Power Macintosh 6500/225