The Input/Output... menu item from the MMS Options... menu brings
    up a dialog box.

    Use this dialog box to set options for the MMS command-these
    options correspond to MMS command line qualifiers. If the
    currently-selected context already includes any of these MMS
    option settings, this dialog box reflects that information;
    otherwise, the default settings are represented.

    The effects of clicking on the dialog buttons are as follows:

    o  Input label - Click on the buttons and use the text fields
       following this label to specify input files for any subsequent
       build.

       -  Description File push button-click on this button to
          bring up a file selection dialog box to specify the MMS
          description file.

          +  Description file toggle button-click on this button
             to specify an MMS description file for any subsequent
             build.

          +  Description file text field-enter the file specification
             of the MMS description file. If the file selection box
             is used, this field will be filled in with the selected
             file.

       -  Regard as Changed toggle button-click on this button to
          direct MMS to treat only the specified sources as having
          been changed, regardless of their actual modification
          times. No date checking is performed at all; that is MMS
          simply rebuilds any targets that depend on one or more of
          the specified sources.

          +  Changed Source text field-enter the file specifications
             of the source files to be regarded as changed. If more
             than one source is indicated, use a comma-separated
             list. If the file selection box is used, this field will
             be filled in with the selected file.

    o  Output label - The buttons and text fields following this
       label are implemented as toggle buttons, although some require
       additional information. If an additional file specification
       needs to be specified, a file selection widget is used.

    o  OK - to dismiss the dialog box and write changes made to the
       current context.

    o  Cancel - to dismiss the dialog box, discarding current changes
       made.

    o  Help - to bring up a help window containing text describing
       the dialog box.