There are only two occasions when you must source the setup file. The first is if you are installing the Rational® ClearQuest® Web components to set up a Web server.
The second is if you intend to use the Rational ClearQuest Client for Eclipse or any other Rational client built from Eclipse Workbench technology. To use the Rational ClearQuest Client for Eclipse, source the setup file and then start the client from the command line in the same shell in which you sourced the setup file.
source cquest–home–dir/cq_setup.csh
. cquest–home–dir/cq_setup.sh