...Spalding
The authors are Members of the Technical Staff at Silicon Graphics, Inc. Mark, Allen, and Dave work in the X Window System group; Simon works in the OpenGL group. Electronic mail can be addressed to mjk@sgi.com, shui@sgi.com, aal@sgi.com, and spalding@sgi.com.

...version
Shipping with IRIX 5.1; IRIX is the Silicon Graphics version of the Unix operating system.

...server.
This information is based on a performance characterization from a README.MTX file available to X Consortium members. The file is time stamped May 3, 1993. Presumably the MTX tests were run on a multi-processor machine.

...code,
We chose to base our PEX implementation on Digital Equipment Corporation's PEX product, but that fact is irrelevant to multi-threading. The same techniques that we describe could be applied to the X Consortium's PEX implementation.

Mark Kilgard
Sun Jan 7 19:20:04 PST 1996