If CMS is installed on your system and your source files are in the current default CMS library, MYPROG.EXE may be built from the CMS library when you issue the following command: $ MMS/CMS This command causes MMS to fetch the description file, if necessary, and source files from the CMS library, and perform the actions needed to create an up-to-date MYPROG.EXE. If a module, for example A.BLI, is replaced in the CMS library (by you or anyone else), thus causing a later version of A.BLI to exist in the library, the command $ MMS/CMS causes MMS to fetch the new CMS element A.BLI, compile it, add it to the MYPROG.OLB library, and produce a new MYPROG.EXE by executing the LINK command.