A couple enhancements should be added to make Robot easier to use and more cross-platform:

* getMouseButtons:
There is presently no way to query the number of mouse buttons available on the system. It may be that different testing should be done on 3, 2, (or 1)-button systems. At this point, there is no way to make this distinction. Some programs assume that there are always 3 mouse buttons. Bug 4700242 was filed againast Solaris x86. The problem has to do with Robot attempting to press button 3 on a system configured with a 2-button mouse.

* getPopupTrigger:
There are many possible popup triggers across platforms: Button3-Press (X-Windows), Button3-Release (Windows), Button2-Press (X-Windows w/ a 2-button mouse), Control-Button1-Press (MacOS). The isPopupTrigger() method can detect all of these within the context of MOUSE_PRESSED and MOUSE_RELEASED events. However, you can't go the other way. There is no way to determine what mouse actions the Robot should perform to test popupMenu functionality on the current platform.