RSEXEC

[larsbrinkhoff]

I haven't found any copy of RSEXEC.

Here's a PDF:
rsexec.pdf

[larsbrinkhoff]

Tomlinson explains how CREEPER (and REAPER) used RSEXEC to spread across ARPANET.

https://nerdology.org/2014/11/qa-with-ray-tomlinson-on-creeper/