Some applications use function keys to perform commands. For example, QuarkXPress uses F10 to show/hide the Page Layout (or Document Layout) palette, F11 to show/hide the Style Sheets palette, and F12 to show/hide the Colors palette.
In Mac OS X 10.4, those Fkeys are commandeered by the operating system to control Exposé and Dashboard.
To give those Fkeys back to QuarkXPress, choose Apple menu> System Preferences> Dashboard & Exposé.
In the Keyboard Shortcuts area, assign a modifier key to those features. Adding the Control key may be a good option for you: Control-F9, Control-F10, etc.
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