Just thought about it, if you are planing to be running it from crontab, and dont want it shown, on your tty11 (<ctrl><alt><F11> then use the word reboot in the crontab line ie:
this will only perform the execution line when crontab is beeing started, ie when your system boots. And it will not be tried run every hour.
@reboot cd /usr/ghclient099_linux/; ./ghclient.x -nice 19 > /dev/null 2> /dev/null
The reason why pbharris want to run it every hour, is if the current running GAH should get an illformed work-unit, then it will terminate, and the crontab starting it every hour will make sure it will be up and running again within the hour, if such a termination should have been encountered.
GAH in itself will terminate the executed copy, if it detects an allready running copy.