This is a takeout of a 12/08/04 posting I made on the MUG forums:
3. When placing a Break away Tab at the edge of a board and that Tab has drill holes the encroach into the boards far enough that copper with in the board is reached, there is no way to relieve the copper from around the holes. There seems to be no composite layer or image where one graphic element image can be subtracted from another element's image. This is the way that it is done in GerbTool when Tabs are added to a panel. Pre placing Tabs in the single image file is not the answer as the Tabs around the outside boards of the panel are not the same as the Tabs where the inner boards border on each side of the Tab. Also, Fablink XE Pro lets you import multiple different boards into one panel and having a single width Milling path that has matching Tabs built into multiple single image files is mostly luck.
4. Speaking of Break away Tabs. It would be very nice that when you placed a Tab over a Milling contour that the software would automatically break the Milling contour into two paths ending at either side of the Tab. It has been a while but I believe that this is what PCB Engineer use to do when you placed a Tab.