The value of tmnxSubInfoModifySubIdent allows to specify a new
name for this subscriber.
When a SET of this object is done, with a non empty string, the
system will attempt to rename the subscriber referred to by this row.
If this action is successful, this row will be automatically removed
by the system, and a new row will be created for the renamed
subscriber.
GETs and GETNEXTs on this variable return an empty string.