We did some work on using X with a firewall.
The paper "X Through the Firewall, and Other Application Relays" by
G. Winfield Treese and Alec Wolman appeared at the Summer '93 USENIX
conference. The paper is also CRL Technical Report 93/10, available
by FTP from crl.dec.com:/pub/DEC/CRL/tech-reports/93.10.ps.Z or by
sending mail with "help" in the body to techreports @
The software is available from crl.dec.com:/pub/DEC/xforward.tar.Z;
the kit does not include the paper.
Win Treese Cambridge Research Lab
com Digital Equipment Corp.