Associate a special graphics extended data structure with another structure via the other structure's pointer. Later, when you call GfxLookUp() with the other structure's pointer you may recieve the pointer to this special graphics extended data strcuture, if it is available
INPUTS
pointer = a pointer to a data structure node = an ExtendedNode strcuture to associate with the pointer
RESULT
an association is created between the pointer and the node such that given the pointer the node can be retrieved via GfxLookUp().