PDFOSNAP system variable
Function Description:
The PDFOSNAP system variable is used to determine whether to active object snap for geometric drawing in PDF underlay attached in drawing
Type : Integer 
Saved in : Registry 
Initial value : 1 
Range : 0,1 
System Variable Value:
0 : object snapping is disabled for geometry in all PDF underlay attachments in the drawing
1 : object snapping is disabled for geometry in all PDF underlay attachments in the drawing