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.
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.
Jay Nelson is the editorial director of PlanetQuark.com, and the editor and publisher of Design Tools Monthly. He’s also the author of the QuarkXPress 8 and QuarkXPress 7 training titles at Lynda.com, as well as the training videos Quark includes in the box with QuarkXPress 7 . In addition, Jay writes regularly for Macworld and Photoshop User magazines and speaks at industry events.