Well, the only thing close that I know of within the FCL is this:
Microsoft.VisualBasic.Devices.
Computer computer = new Microsoft.VisualBasic.Devices.Computer();
Microsoft.VisualBasic.Devices.
Mouse mouse = computer.Mouse;
But that doesn't tell you "which" mouse is connected.
However, your tablet may have certain Mouse property values set that are different than those of a typical mouse - you could compare them to determine "which" mouse is currently being used.