Each catalog must have a catalog.cfg file located in its base catalog directory. It contains most of the configurable parameters for Interchange. Each is independent from catalog to catalog.
Additional configuration techniques are available in the catalog.cfg file. First, set a Variable and use its results in a subsequent configuration setting if ParseVariables is on:
Variable SERVER_NAME www.akopia.com Variable CGI_URL /cgi-bin/demo ParseVariables Yes VendURL http://__SERVER_NAME____CGI_URL__ ParseVariables No
Define subroutine watches
Almost any configuration variable can be set up to be tied to a subroutine if the Tie::Watch module is installed. It uses a notation like the <<HERE document, but <&HERE is the notation. See Interchange Programming for details.