Ah yes.  Another right click tip this week.
Highlight a viewport in paperspace and right click.  After the first seperator bar in the popup you'll see (4) listing to choose from in AutoCAD 2004 based products.  Viewport Clip, Display Viewport Objects, Display Locked, and finally Shadeplot.  Some of these are toggles and others are a cascading list of commands to choose from.  Go ahead, try it, you'll love it! 
One day we will all be able to use AutoCAD with only the mouse!