-- Command: meter ID/K, HELP/K, NODE/K, ATTRS/K/M, LABEL/K/F
     Meter objects are created with this command.

        * ID [I..] - an id can be assigned to a meter for later
          reference. The id can be any combination of up to 5
          characters.

        * HELP [I..] - with this argument help text may be defined
          which will be displayed as balloon help whenever the pointer
          is over the associated meter. Of course, this is dependant on
          whether the user set up balloon help in the MUI preference
          settings.

        * NODE [I..] - this argument is used to specify a node in the
          guide file given in the command line argument HELP for
          `MUIRexx'. If the user positions the mouse pointer over the
          meter and presses the help button on the keyboard then the
          guide file will be displayed at the node location.

        * LABEL [I..] - if given this label will be displayed in the
          meter.

        * ATTRS [ISG] - with this option any MUIA attribute TAGs may be
          set or retrieved (see Attribute TAGs).

     Some useful TAGs for use with the meter command are:

          TAG_Name =                        TAG_id          Flags Type
          
          Numeric_Default =                 0x804263e8 /* V11 isg LONG */
          Numeric_Format =                  0x804263e9 /* V11 isg STRPTR */
          Numeric_Max =                     0x8042d78a /* V11 isg LONG */
          Numeric_Min =                     0x8042e404 /* V11 isg LONG */
          Numeric_Reverse =                 0x8042f2a0 /* V11 isg BOOL */
          Numeric_RevLeftRight =            0x804294a7 /* V11 isg BOOL */
          Numeric_RevUpDown =               0x804252dd /* V11 isg BOOL */
          Numeric_Value =                   0x8042ae3a /* V11 isg LONG */
          
          Note: Consult MUI:Developer/Autodocs/MUI_Numeric.doc and
                MUI:Developer/C/Include/libraries/mui.h

     Example use of this command:

          window TITLE '"Test"' COMMAND '"quit"' PORT DEMO
              .
              .
              .
              group
                  group HORIZ
                      knob ID KNOB HELP '"an example knob gadget"' NODE '"knob"'
                      meter ID METR NODE '"meter"' LABEL 'meter'
                  endgroup
              endgroup
          endwindow
          
          method ID KNOB Notify Numeric_Value EveryTime,
                         @METR 3 Set Numeric_Value TriggerValue