[CentOS] selenium rc server - run it on a specific display help!

Dear all,

i'm trying to run multiple selenium rc server on a centos box (different ports) with developers connecting to it through VNC (different respective ports) to check their automated test result. i can easily do the above manually (when it comes to running RC server). though automating the process is proving to be difficult. can anyone guide me on how to run a service on a specific display in an automated process?

right now if i connect to a vnc session (any port) and i run it manually through iterm, it works normally. though setting an cron job that does the above, isnt working (rc opens in shell instead of on each dev's assigned display)