void PEXUnpostStructure( Display *display, PEXWorkstation workstation, PEXStructure structure )
None.
Invoke PEXUnpostStructure to remove the specified structure from the posted structure list of the specified workstation.
If the structure is not found in the list, then the implementation issues an error.
For a list of PHIGS Workstation functions and related topics, see PHIGS Workstation.