The "can't open display" message on Jefferson almost always means that
you're either not working at an Xwindows station or you're on a PC and
don't have X emulation software (like Exceed) running. If you're in the
labs, start Exceed and log into jefferson through that--it should set the
display automatically to the machine you're working on. If you're at an
Xstations, which I doubt, then you shouldn't have to do anything to make
it work. If you're at a Unix machine that's not an X station, or if
you're at a PC with X emulation software that isn't configured the way it
is in the labs, then you'd need to know your IP number and you'd need to
type, on the jefferson account, the commands:
DISPLAY=128.143.[whatever].[whatever]:0
export DISPLAY
Last but not least, if you're at a PC without X emulation software, or
dialing in from home, you probably can't run the Unix mapedit program,
but you can find a windows version on the Jefferson ftp site, in
/pub/software/www/pc/win31 as mapedit.zip -- you'll need pkunzip to
uncompress it once you download it; if you don't have that, you can find
it also at jefferson's anonymous ftp site, in pub/software/compression/pc
John Unsworth
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http://www.village.virginia.edu/~jmu2m/ jmu2m@virginia.edu