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usage: OPEN(file,filename,['Append'|'Read'|'Write')

-Accesses an external file
-file argument is the logical 'alias' for filename.
-filename is the actual name of the file and may include device and
directory path.
-returns a boolean value indicating success or failure to open
-no limit to number of open files
-open files are closed automatically when the program exits.
-See also CLOSE() , READCH() , WRITECH() , READLN() , and WRITELN() .