PICKADD
Controls how entities are added to a selection set.
Can be set to one of the following values:
0 = PICKADD is turned off, the most recently selected entity becomes the selection set and previously selected entities are no longer part of the selection set.
1 = PICKADD is turned on. Each entity selected is added to the current selection set.
2 = PICKADD is turned on. Each entity selected is added to the current selection set. If the Select command is used, keeps entities selected after you stop using the command.
Type: Integer
Saved: In the registry
Range: 0 to 2
Default: 2