NSLL, Type, NKEY
Selects those nodes associated with the selected lines.
TypeLabel identifying the type of node select:
S  | —  | Select a new set (default).  | 
R  | —  | Reselect a set from the current set.  | 
A  | —  | Additionally select a set and extend the current set.  | 
U  | —  | Unselect a set from the current set.  | 
NKEYSpecifies whether only interior line nodes are to be selected:
0  | —  | Select only nodes interior to selected lines.  | 
1  | —  | Select all nodes (interior to line and at keypoints) associated with the selected lines.  |