Bamboo is a Wacom product right? My decade old Wacom Gaphire uses the same drivers, still, I believe. In them I can set it to be on only one monitor out of two.
When I run the Wacom Tablet Properties (under Start Menu)...
Click on the Mapping Tab.
Select Monitor 1 (or 2...or 3) under the Screen Area option
Select Full under Tablet Arae option.
That should do it...(if it is the same driver as I suspect).