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  Argument
 
    file_variable    Typed, untyped, or text file; already opened
 
  Description
 
    The Close procedure closes the file associated with file_variable.
    The file must be open. Open a file with Append, Reset, or Rewrite.
 
    Close ends all operations on the specified file and writes to the
    file any data remaining in the file buffer. It then closes the file
    and frees the DOS file handle. The file is still associated with
    file_variable. The file_variable argument can be reopened on the
    same file without reassigning, or can be assigned to a different
    external file.
 
    Reset and Rewrite close and reopen an open file, making it
    unnecessary to call Close before calling these procedures when a
    file is already open.
 
    QuickPascal closes files automatically before a program ends.
 
    If file_variable has not been assigned or if the file is not open,
    an I/O error occurs.
 
    To prevent a program from halting with a run-time error when an I/O
    error occurs, turn off I/O checking with {$I-} and check the return
    value of the IOResult function.