Here is a list of all documented variables with links to the documentation:

• PROTOCOL_REVISION_CLASSIC : fsdclient.h
• PROTOCOL_REVISION_VATSIM_ATC : fsdclient.h
• PROTOCOL_REVISION_VATSIM_AUTH : fsdclient.h
• PROTOCOL_REVISION_VATSIM_VELOCITY : fsdclient.h
• sApp : application.h
• sGui : guiapplication.h