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gmBasic has a programmable pre-processor that allows migration teams to modify the source code in memory before it is processed for translation. Conceptually speaking it is a search and replace facility. In its simplest form, the pre-processor is invoked by the Compile/Fix or Refactor/EditFIle commands.

If you are changing your source solely to prepare it for migration, it is a best practice to use the pre-process command rather than doing them directly by hand. Using the pre-processor documents the changes, applies them systematically, and makes them repeatable and trackable. This is particularly important if the source code is under active maintenance outside of the migration effort.