Application Under Test (AUT) Base URL.
In Test-Odyssey, AUT URL is stored in two parts - Base URL and Fragment URL.
Base URL changes from Development to Stage to UAT environment.
In Test-Odyssey recording is done once and can be run in any environment by providing its base URL.
Fragment URL is recorded in the datasets of the test-case. It doesn't change between Environments.
It is specific to the functionality the test-case intends to test.
Example :
http://www.example.com/myModule.do
Here Base URL : http://www.example.com and Fragment URL will be /myModule which will be stored as part of the test-case.