For those ADT users who take advantage of the Project Navigator (which I think is a great start to drawing management) and notice the AutoCAD Sheet Set Manager coming up as well you will want to make yourself aware of the system variable: ssmautoopen
This controls whether AutoCAD displays the Sheet Set Manager when a drawing associated with a sheet set is opened. If you get this coming up everytime you are working with project drawings and wish only to see/use the PN; set the variable value to 0.
0 = Do not open the Sheet Set Manager automatically
1 = Open the Sheet Set Manager automatically