DRL CGROUT (octal 46) - process line switch.

drl    cgrout
vfd    18/0,6/op,H12/line-id
zero   l(snumb),0

op=25 (octal): for line-switch from TSS to DAC; "line-id" is the station code or line identifier of the line to be switched.
op=26 (octal): for line-switch from DAC to TSS; "line-id" is zero if all lines connected to "snumb" have been reswitched or "line-id" is the line identifier of a line which is still connected (receiving output).
op=27 (octal): for JDAC line switch (TSS to DAC). The function is similar to "op=25", except that subsystem execution is suspended until the batch job terminates.

This derail is used for two purposes.

To switch a remote-terminal line (identified by "line-id" and connected to TSS) to direct-access connection with the slave program identified by snumb. (The line-id can either be considered as a two-character code interpreted in BCI -- that is, the GRTS "station code" -- or as a four-digit octal number, which corresponds to the channel number printed by TSS.) The specified batch slave program must have been submitted through TSS.
The complementary use of this derail is to switch any lines connected to the slave program identified by snumb back to TSS, provided such lines were originally connected to TSS. This usage of the derail (op=26) may need to be repeated until line-id (bits 24-35 of the argument) indicates that all lines have been switched. Note that "line-id" needs to be zeroed before each repeat call.