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Tektronix' X terminals can support running X over serial lines using
Serial Xpress. Here is a brief overview of Serial Xpress.

Simply stated, Serial Xpress is a means by which X applications can be run
on a remote computer over RS-232 lines with resonable performance. SXp is
easy to use and install. SXp was designed to meet the needs of those persons
that would like to run X from a remote location. SXp does not run on top of
any existing protocols like SLIP, or PPP, but instead has a transport protocol
built in.

In X terminology, client applications make requests to the server, and the 
server sends replies to the client. In order for X requests and replies to be 
transmitted with reasonable performance over a serial line, they must be 
compressed, and request and replies from different clients must be interleaved
on the line. This is how SXp works. Basically, a process is run on a host that 
becomes the X terminal's "PSEUDO SERVER". This is where all the X requests that
would normally be sent to the terminal are routed. The "PSEUDO SERVER" takes 
the X requests, compresses them, multiplexes the requests for different clients,
and transmits them to the X terminal. The X terminal also has a process running 
internally that demultiplexes requests for different clients,decompresses those 
requests, and sends them to the true X server. The process running on the 
terminal also compresses and multiplexes the replies for transmission. 

By the way it is much faster than Xremote and can support network and serial
connections simultaneously.

John Kihn
NWD Product Marketing
503-685-2346
800-225-5434 (Sales Information)