Environment variable inheritance in chained projects
When a project is launched through a pass/fail chain, the system
applies environment variables from the calling project. The called
project sets up variables from the calling project's environment and
its own environment in the following order:
Called project server environment.
Calling project's variables, in a set, with "BF_" variable
names changed to "BF_CALLER_".
Called project environment.
Step environments (if specified) as they are run.
Note: To control the order of variable setup, you can use the Server
Env Before Chain configuration setting. See System configuration settings.