OSNAPCOORD system variable
Function Description:
The OSNAPCOORD system variable is used to control whether the entered coordinates in command line replaces the running object snap.
Type : Integer 
Saved in : Registry 
Initial value : 2 
Range : 0,1,2 
System Variable Value:
0 : the running object snap replaces keyboard entering coordinates
1 : the running object snap replaces keyboard entering coordinates 
2 : keyboard entering coordinates replaces the running object snap except for settings of scripts