Follow the instructions in the installation section of this user manual and then at a shell prompt type the following: [user@localhost /home/user]$ gdms To open a data set, select File - Open. Browse to the location of the desired data set and then click Open. After the data set has been loaded, use the Maths menu to carry out data processing. For further details of specific options, please refer to the chapter titled 'Using GDMS'. To close the data set currently in focus, select File - Close.. To exit the program, select File - Exit. To save the data set after processing, select File - Save. Choose the desired location and click OK. To save under a different file name, select File - Save As. Choose a location, enter the filename and click OK. For further details on these features and the other GDMS functionality, please refer to the section titled 'Using GDMS'.