Retrieves the size of the bottom unprintable margin for the current printer.
the distance from the bottom edge of the page that is not printable, in 1/100ths of an inch. No characters or images will appear in this area.
A print template uses the unprintableBottom, unprintableLeft, unprintableRight, and unprintableTop properties to determine the unprintable area along the edges of a page; content placed in this area cannot be printed by the current printer. A print template should avoid placing content in this area.
This property is always measured in 1/100ths of an inch, even if the user has changed the measurement system in the Regional Settings to metric.