#define SWITCH '@'.

there are 4 kinds of commands defined.


SWITCH, SWITCH   This just sends the SWITCH character through. Used to escape
		the switch character.

SWITCH, SWITCH+n Switch to the stream n. Streams are numbered from 1.

SWITCH, SWITCH-1, "%s" , 0
	Do the control sequence "%s" on the local end.
SWITCH, SWITCH-2, "%s" , 0
	Do the control sequence on the remote end.
SWITCH, SWITCH-3, "%s", 0
	Pass the control sequence through to the remote client. This is
	how the results of commands are passed back to the client. A 
	switch, switch-3 sequence is generated in the term server, and passed
	to the client.

"%s" is simply a string of non-zero bytes.
Legal control sequences are.

C_UPLOAD "%s"
	To attach a O_TRUNC|O_CREAT file to the file descriptor.
	(only makes sense as a remote command).
C_DOWNLOAD "%s"
	To attach a O_RDONLY file to the file descriptor.
	(only makes sense as a remote command).
C_CLOSE
	Close the file descriptor. Used to close the file. 

C_PTYEXEC "%s"
	as above, but opens a pty to exec it in first. This is how
	remote shells are spawned.

C_DUMB  
	Downgrade clients status to dumb. All control message are now
	ignored, and all switch characters become escaped. Only makes
	sense as a local command.

C_COMPRESS "%c" where c is 'y' or 'n' to force turning on 
	or off of compression respectively. 

C_PORT "%s:%d" to open a connection to port %d on the host %s. The "%s:" may
	be omitted to open the port on the remote host.

C_SOCKET "%s" to open the unix domain socket with name "%s".


C_PRIORITY "%d" to set the clients priority to %d. 0 is default.
	tupload defaults to -2, and trsh to 2. The local priority is
	seperate from the remote priority. The priority only determines
	the order in which clients are checked when looking for more
	bytes to send. Two clients with equal priority will share bandwidth.

C_STAT "%s" where %s is the name of a remote file. Returns a string being
	the file size, the type, and the permissions. "%d %d %d". type
	is 0 for a file, 1 for a directory, 2 for anything else.
	The permissions are 4+2+1 for the term program (rwx).

C_STATS "%d". where %d is 
	>= 0 to stat that client number.
	-1 for a space seperated list of active client numbers.
	-2 , "%d %d", being the number of bytes fed to the compressor,
		followed by the number of bytes output by the compressor.
	-3 "%d %d", being the number of bytes read from the modem port,
		followed by the number of bytes written to the modem port.
	-4 "%d %d", being the number of packets in the input queue, followed
		by the number of the packets in the output queue.
	-5 "%d" being the baudrate term is operating at.
	-6 being the client number of the client that asked for the C_STATS.

C_SEEK "%d" lseek()s to that offset on the filedescriptor.

C_NAME "%s" sets the name of this client to be '%s'.  Returned by C_STATS

C_RESIZE "%d %d %d", sets the window size of client %d to be %d columns
	wide by %d rows high.

C_BIND "%d" binds the remote port %d. When the socket is ready for
	accept()'ing, a magic number is written to the stream. This number
	should be passed as a parameter to C_ACCEPT. It is acceptable to 
	select() on the server socket until it is ready for reading. If it
	is ready for reading, then the socket must be ready for accepting.

C_ACCEPT "%d" tries to do an accept() on the socket indicated by the magic
	number. The number is the result of a C_BIND command.

C_DUMP "%d" effectively makes term go dump for the next %d bytes. All command
	bytes are ignored in the data stream untill %d bytes have passed.
	Measured from the first byte to be send after the C_DUMP command.
	Sending 0 means to go dumb permenently.