The PICKDRAG system variable has been updated in AutoCAD 2012 to include a new option. Traditionally (before AutoCAD 2012), you had to choose between two methods for specifying a selection window. When PICKDRAG is set to 0, you create a selection window by picking (and releasing) to specify the first point and then picking (and releasing) to specify the second point. If PICKDRAG is set to 1, you pick the first point and continue holding down the mouse button as you drag. Releasing the mouse button specifies the second point of the selection window. A new option in AutoCAD 2012, PICKDRAG = 2, combines both of these behaviors so you don’t have to choose!