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 Defines global variables for sharing between modules or between chained
 programs.
 
    COMMON [SHARED] [/blockname/] variablelist
 
    ■ SHARED          Indicates variable to be shared with all SUB or
                      FUNCTION procedures in the module
 
    ■ /blockname/     Name of memory block location where COMMON variables
                      are stored (slashes required); if omitted, variables
                      are stored in a blank common area
 
    ■ variablelist    List of variables to share:
 
                      variable[()] [AS type] [, variable[()] [AS type]]...
 
                      • variable  Any valid variable name
 
                      • ()        Indicates array declaration
 
                      • AS type   Any valid data type; use a separate AS type
                                  clause for each variable defined
 
 See Also
    ◄$INCLUDE Metacommand►             ◄Keeping Variables Common►
    ◄OPTION EXPLICIT Statement►        ◄Scope Rules►
    ◄Using Named COMMON►               ◄Using COMMON with CHAIN►