PICKDRAG system variable
Function Description:
The PICKDRAG system variable is used to control the method of drawing a selection window.
Type : Integer 
Saved in : Registry 
Initial value : 2 
Range : 0,1,2
System Variable Value:
0 : selecting window by specifying two points. Clicking once to begin window selecting, clicking the second time to complete selecting.
1 : click and drag to specify window selection. Release the mouse to complete selecting. 
2 : either methods of above to specify window selection.