.p
This is DEC's TPU, invoked via the TPU$TPU interface -
for further information see "VAX/VMS Utility Routines Reference 
Manual, section TPU, subsection TPU$TPU".

.p
It has been tailored to use the Ministry of Forestry's EVE-WHIPS editor by
default.
.l
If you want to overrride this and use a different flavour of TPU, then define
a logical name in your LOGIN.COM thus:
.p
$ define/nolog##TPU$SECTIO##my-tpu-initialisation-file