Option Compatible turns on the VBA-compatible Basic compiler mode at the module level.The function CompatibilityMode() controls runtime mode and affects all code executed after setting or resetting the mode.This option may affect or assist in the following situations:Allow special characters as identifiers. all characters that are defined as
letter in the Latin-1 (ISO 8859-1) character set, are accepted
as part of identifiers.Create VBA constants including non-printable characters.Support Private/Public keywords for procedures.Compulsory Set statement for objects.Default values for optional parameters in procedures.Named arguments when multiple optional parameters exist.Preload of %PRODUCTNAME Basic librariesOption Compatible is required when coding class modules.Option Compatible
Special characters as identifiers
Option Compatible' With this option the code works, otherwise it causes a compiling errorSub Main ä = 10 print äEnd SubStatement Option VBAsupport 1 sets Option Compatible statement automatically.Variables scope modification in Using Procedures and Functions with CompatibilityMode() function.Refer to Identifying the Operating System and Getting Session Information for class module examples, or Access2Base shared Basic library for other class examples making use of Option Compatible compiler mode.