DWFFRAME system variable
Function Description:
The DWFFRAME system variable is used to control whether the DWF or DWFx reference layer frame is visible or not, and plot or not.
Type : Integer 
Saved in : Drawing 
Initial : value 2 
Range : 0,1,2
System Variable Value:
0 : do not display or plot the frame of DWF or DWFx reference underlay
     It temporarily displays this frame when previewing selection set or selecting objects. 
1 : display and plot the frame of DWF or DWFx reference underlay
2 : display but do not to plot the frame of DWF or DWFx reference underlay