UsrOutPtr                Pointer to USR: Output Driver

 UsrOutPtr                                                               [TP]

    Turbo Pascal supports the predefined device USR:, both as a filename
    and as a predefined file variable. Output to this device is handled
    through the procedure UsrOut(Ch : Char), which simply makes MS-DOS
    system call 2. You can declare your own procedure UsrOut, then assign
    its address to UsrOutPtr; this makes your function the new output
    driver for the USR: device.

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

           UsrOutPtr := Ptr(MyUsrOut);