jerry@raphael ~ $ /usr/NX/bin/nxagent :1000
Couldn't open RGB_DB '/usr/X11R6/lib/X11/rgb'

NXAGENT - Version 1.5.0

See http://www.2x.com/ for more information.

Info: Agent running with pid '19265'.
nxagentProcessOptionsFile: Option file is [(null)].

Fatal server error:
NXAGENT: Unable to open display "".