The GPT public interface is contained within a single PERL module called GPT.pm. Ideally, this should be the only GPT module that needs to be included in third-party products. This module translates its public interface into more-complicated internal GPT requests which are past to other GPT modules.
In order to use this module you must follow the standard PERL method for module locating by adding its location to your scripts @INC. In addition, the environment variables $GPT_LOCATION and $GLOBUS_LOCATION should be set prior to calling this module.