Paul,
 
Well, the solution is simple.
Login as MANAGER.SYS and type :SYSGEN
sysgen> misc
misc>show
and you'll see something like:
LOGON PROMPT           logonprompt           MPE/iX:
type: misc> sy logonprompt="This is a very long line for testing &
> the logon prompt of mpe/ix. Can be up to 255 chars:"
misc>hold
misc>exit
sysgen>keep
yes
sysgen>exit
=SHUTDOWN
 
Hope this helps,
Danny Yanai
 
 ___________________________________________________________________________
|     ______               _______ |ADDRESS: Danny Yanai                    |
|    /        /\  /\      /      / |         HP-CMS                         |
|   /        /  \/  \    /______   |         11 Hashlosha st.               |
|  /        /        \         /   |         Tel-Aviv 67070                 |
| /______  /          \ /_____/    |         Israel                         |
|                                  |PHONE:  ++972-3-5380-534                |
|                                  |FAX:    ++972-3-5380-515                |
|    Computation & Measurement     |HPDESK: Danny Yanai/CMS/10              |
|           Systems Ltd.           |E-Mail: [log in to unmask]     |
|                                  |or(for binary files): [log in to unmask] |
|_________HEWLETT-PACKARD__________|________________________________________|