(Case 00325109)
Hello,
If the pen used with the slate is the same one used at that board, then you should be able to pass the ActivPen between the user of the ActivSlate and the user at the ActivBoard and have it operate both.
If each device has its own pen, then they can both be used, just not at the same time. The pen use at the board would need to stop for the use of the pen with the slate to function correctly.