USR                      Predefined File Assigned to USR:

 USR

    USR is a predefined file variable assigned to USR:, which is a user-
    definable I/O device. By default, it is assigned to CON:; however, you
    can reassign it to any other device desired. You can use it in Read
    and Write statements without calling Assign, Reset, or Rewrite.

  -------------------------------- Example ---------------------------------

           Readln(USR,Line);
           Writeln(USR,Line);