Caché MultiValue Basic Reference
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Class Reference   

A program line identifier.
A label is a unique identifier for a program line. A label must appear in column 1; it cannot be indented. A label can be on a line by itself, or be followed by an MVBasic command on the same line.
The following are the naming conventions for labels:
Labels are used by the GOTO statement. This statement may be abbreviated as the GO statement.
A label cannot be used on a program line containing a SUBROUTINE or FUNCTION command.