/* $DOC$
   $NAME$
      ft_TempFil()
   $CATEGORY$
      DOS/BIOS
   $ONELINER$
      Create a file with a unique name
   $SYNTAX$
      ft_TempFil( [ <cPath> ] [, <lHide> ] ) -> cFileSpec
   $ARGUMENTS$
      <cPath> is the directory where you want to create the temporary
      file.  If you omit this argument, the root of the current drive
      is assumed ("\").

      If <lHide> is .T., then the file will be created with the hidden
      attribute set.  The default is .F.
   $RETURNS$
      <cFileSpec> should be your path, including the name of the newly
      created unique file.  You are safe to create a new file with
      this filename.

      If a DOS error occurred when trying to create the file, a
      null string will be returned.

   $DESCRIPTION$
      This function uses DOS Interrupt 21, service 5Ah (Create temporary
      file) to create a unique filename in a directory you specify.
      There will be no extension.  After the file is created, you may
      do any I/O you need (see the test driver in the source code).

      This function requires ft_int86().
   $EXAMPLES$
      // Create a unique file in the root of the current drive:
      ? ft_TempFil()

      // Create a unique file in the current directory and hide it:
      ? ft_TempFil( ".", .T. )

      // Create a unique file on another directory, but do not hide it:
      ? ft_TempFil( "mytempdir" )
   $END$
 */