The SACS GCG web interface is designed to be a two tier system. The first tier is the basic level, in which the user has little control other than choosing which section of the pasted-in sequence is to be used for the analysis run.

In the second tier, or advanced level, the user is required to know more about the operation of the selected program. Links to the program's Help Page ensure the making of informed decisions during the run.

Currently, the user pastes in a sequence when using the interface, but this will soon be changed to allow greater flexibility in data-entry.