The following group codes are used by GROUP objects.
GROUP group codes
Group code
Description
0
Object name (GROUP)
5
Handle
102
Start of persistent reactors group; always “{ACAD_REACTORS” (persistent reactors group appears in all dictionaries except the main dictionary)
330
Soft-pointer ID/handle to owner dictionary. For GROUP objects this is always the ACAD_GROUP entry of the named object dictionary
End of persistent reactors group, always “}”
Soft-pointer ID/handle to owner object
100
Subclass marker (AcDbGroup)
300
Group description
70
“Unnamed” flag: 1 = Unnamed; 0 = Named
71
Selectability flag: 1 = Selectable; 0 = Not selectable
340
Hard-pointer handle to entity in group (one entry per object)