In QuarkXPress, if you want to drag a guide from the ruler onto your page, and you want the guide to cross over spreads and extend onto the pasteboard, just drag the guide out from the ruler and onto the pasteboard.
This works on the pasteboard above and below the page, as well as to the left and right.
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.