* The multi-modular technique goes back to when '''QBasic''' and '''QuickBASIC''' had module size constraints. In '''QB64''' the [[COMMON]] statement has been implemented so that that older code can still be compiled, though it is advisable to use single modules for a single project (not counting [[$INCLUDE]] libraries), for ease of sharing and also because the module size constraints no longer exist.
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* COMMON must be called before any executable statements.
* [[SHARED]] makes the variables shared within [[SUB]] and [[FUNCTION]] procedures within that module.
* variableList is the list of common variables made available separated by commas.
* Remember to keep the variable type ''order'' the same in all modules, as the variables names don't matter.
* [[COMMON SHARED]] is most commonly used to share the variables with subs and functions of that module.
* '''Note: Values assigned to shared variables used as procedure call parameters will not be passed to other procedures. The shared variable value must be assigned inside of the [[SUB]] or [[FUNCTION]] procedure to be passed.'''