The OMG command starts a Space Telescope Observation Manager Window. The Observation Manager is a tool which lets OPUS users conveniently 'View' and 'Manage' the observations as they are processed through the pipeline.
Observations are the raw or processed data generated as an exposure on the telescope.
They could be a single dataset or a combination of datasets which are processed together as an 'association'. For more information on the Obsevation Manager functions, access the Help button from within the Observation Manager Window. Motif applications can be tailored to the user's likes by an application defaults file. The template for the application defaults file, OMG.DAT, should be copied to the user's login directory to set up Observation Manager Window defaults. For more information on the use of the application defaults file see the Motif User's Guide.