Michael,

a) After you telnet to the TAC (telnet access card) it feels
   like a DTC prompt, you issue "connect" commands like you do
   with a hardwired DTC terminal. To the 3000 you feel like a
   plain DTC terminal (Avesta Flow Control Protocol, I think).

b) Sorry, but I do not know the numbers by heart, maybe it was
   something like 40..80 telnet session per card/dtc (depending
   on the DTC size and what applications you run i.e. character
   mode or vplus). Someone correct me, please!

   Maybe the Communicator or LaserROM has some details here.

c) As far as I remember it will work as of MPE/iX 4.0 - well,
   at least it does not need 5.0 or later to be installed.

Notice that there is/was also a Telnet Express Box, as far as
I understand a "standalone telnet card", in case you don't have
a DTC at hand where a TAC could be added. I'm guru on this...

Last but not least a GOTCHA to be aware of: the Telnet protocol
does not like the Break key quite much. You either have to fiddle
around with "Ctrl-] send break" (i.e. escape to the telnet prompt
and type a command to signal a break to the host side) or else
might tell use "Ctrl-] toggle localchars" and use Ctrl-\ instead
of Break.

Guess why I prefer direct DTC ports or NS-VT connections ;-)

Lars/iX

([log in to unmask] - only speaking for lappel, not for grc.hp.com)