The serial numbers for my Meadows XTensions for QuarkXPress?

With QuarkXPress open:

Mac OS 9: Press the Option key while choosing “About QuarkXPress” from the Apple menu.
Mac OS X:
Press the Option key while choosing “About QuarkXPress” from the QuarkXPress menu.
Windows: Press the Alt key while choosing “About QuarkXPress” from the Help menu.

Scroll through the list of XTensions and click on the desired module. The serial number for the selected module will display: