using an external MightyMouse I have no problems right-clicking in Windows XP inside Parallels. But HOW do I do this using the buildin trackpad? The Ctrl-Trackpad press I use inside OSX does not work. I can't find the solution.
In the Parallels Desktop | Preference menu, choose the Hot Keys tab and configure right click however you'd like. I'll warn you that Ctrl+Click is a bad choice for use in Window, as the key combo is used in many applications for other purposes. You can also enable in you system preferences, the ability to right click by leaving a finger on the track pad while you click. This will pass through to Parallels.