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Procedure 


   . A procedure is any executable block of code.  In Clipper, this can
     be a program file (.prg), a format file (.fmt), an explicitly
     declared procedure (PROCEDURE), or an explicitly declared
     user-defined function (FUNCTION).


   . Any executable block of code beginning with the statement PROCEDURE
     <procedure name>.  A procedure can be invoked using a DO statement
     or function-calling syntax.

     Note: Memory variables arguments passed with DO are passed by
     reference by default, where function-calling syntax passes by value
     by default.