Sends to and receives from sockets.
Sends the command
cmdNr and the
flags. The command
numbers are application specific. If
flags is used,
flags is the numeric (integer) representation of the flags is
to be set. If the # is omitted,
flags is a list of
symbolic flags. Currently, there is only one flag:
multiple or noflush with the
same meaning, indicating that there is more to follow and no
automatic flush on the channel should be done.
Receives a message from channelName. The other arguments are the names of the corresponding variables which will contain the message. The flags are returned numeric. (To handle these flags, use the web::msgflag function).