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$scanSet is used to associate characters with an INTEGER that can be used with the PROCEDURE scan.
This INTEGER value returned by $scanSet is associated with the characters of scanChars when used by scan.
A large number of INTEGERs are available as scan INTEGERs.
scanSet provides bits that may be used with scan. More than one bit may be used at a time with scan, but only a limited number of them are available.
Values returned from $scanSet should not be saved in a file or structure image; they are valid only during the current execution.
MAINSAIL Language Manual, Section 47.5