Write a value to the filenum file. If filenum is 1-5 then the file is a text file, and the value is appended to the end - recnum is ignored. If filenum is 6-10, then the file is structured, and value is written to the record given by recnum. If recnum is zero or omitted, value is appended to the file.
writes the string as the third record in file 6.
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