Defines global variables that can be shared throughout a program or between
chained programs.
 
COMMON [SHARED] variablelist
 
    - SHARED          Indicates that variables are shared with all SUB
                      or FUNCTION procedures.
    - variablelist    One or more variables to be shared:
 
                      variable[( )] [AS type] [, variable[( )] [AS type]]...
 
                      variable    A Basic variable name. Variable names can
                                  consist of up to 40 characters and must
                                  begin with a letter. Valid characters are
                                  A-Z, 0-9, and period (.).
                      type        The data type of the variable (INTEGER,
                                  LONG, SINGLE, DOUBLE, STRING, or a
                                  user-defined data type).
 
    - Unless it has been declared as a static array in a preceding DIM
      statement, an array variable in a COMMON statement is a dynamic array.
      Its dimensions must be set in a later DIM or REDIM statement.
 
See Also    <CHAIN>    <DIM, REDIM>    <FUNCTION>
            <SHARED, STATIC>           <SUB>