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 Keeping Variables Common
 
 ■ Variables may not be passed through COMMON if you move some of your SUB
   procedures to another module. This is often caused by an improperly placed
   or nonexistent COMMON SHARED statement in the second module. The various
   combinations of COMMON, SHARED, and COMMON SHARED can be confusing.
 
 ■ One method that works correctly is to use COMMON statements throughout
   your program. To simplify the use of COMMON statements, use the $INCLUDE
   metacommand to group common definitions into an include file. In a larger
   project, it is much easier to maintain a single file.
   See: ◄$INCLUDE metacommand►
 
 ■ If you prefer using multiple COMMON statements:
   • Insert a COMMON SHARED statement at the beginning of the main program.
     For example:
 
         COMMON SHARED A, B, C, D
 
   • Insert a duplicate COMMON SHARED statement at the module level of all
     other modules. Edit these modules by choosing Code from the View menu
     (or press F2), then choose the name of the module you wish to edit.
 
 See: ◄Scope Rules►