Syntax
where is an integer representing an output
channel number.
The ECHANNEL: command selects the channel number for exported
quantities. The channel number must previously have been associated
with an external output file by using the CHANNEL: command.
This command only has any relevance for future EXPORT: commands.
The export channel can be the same as the current output channel. In
particular, material exported will be appended to this channel if it is
already in use for the current [B/D] session.