This might work, if you can get at EDT in the state before
SYSTARTUP_VMS executes.
I haven't tried it to see if you can.
http://h71000.www7.hp.com/wizard/faq/vmsfaq_004.html
Who remembers how you could interrupt an RSX startup and
then, with luck,
PIP your way out of trouble with files that shouldn't have
been there?
Don Mitchell