DWFOSNAP system variable
Function Description:
The DWFOSNAP system variable is used to control whether to active object snap mode for geometric drawing in attached DWF or DWFx reference underlay.
Type : Integer 
Saved in : Registry 
Initial value : 1 
Range : 0,1
System Variable Value:
0 : disabled all object snap for geometric drawing in attached DWF or DWFx reference underlay
1 : disabled all object snap for geometric drawing in attached DWF or DWFx reference underlay