Issuing the ENABLE command will enable 270x terminals and locally attached 3270's to access
VM370 that were previously disabled or never enabled to begin with. Remote 3270's and 3704/3705's
must be enabled thru the use of the NETWORK command. No indication is provided if there are no
lines eligible to be enabled. The QUERY command can be used to determine line status.
Reference the detailed IBM manaul page here.