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 MEANING: FILES Subroutine
 CONTEXT: NONMEM utility routine

 USAGE:
 INTEGER IUNIT
 CALL FILES (IUNIT)

 DISCUSSION:
 Whenever a FORTRAN OPEN statement or a CLOSE statement is executed  in
 a  user-supplied  routine,  NONMEM  should be informed. This should be
 done as follows: Immediately after the OPEN or CLOSE statement is exe-
 cuted, a call should be issued to FILES.

 Input argument:

  IUNIT
      An integer variable or integer constant; the number of the  logi-
      cal unit involved in the OPEN or CLOSE statement.

 If reads or writes are issued to a given unit, but no  OPEN  statement
 for  this  unit  is  executed,  then  when ICALL is 0, a call to FILES
 should be issued (before any I/O statement involving this file is exe-
 cuted),  where IUNIT is the number of the logical unit. However, reads
 and writes to a unit which has not been opened (connected) may not  be
 allowed by some operating systems.

REFERENCES: Guide III Section IX.3


  
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