VMS Help TCPIP Services, TELNET, TN3270 Keyboard Functions, PRINT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    VT100: EXT + P              VT200: F11
    DEFINE_KEY Function: PRINT

    Records the contents of your screen in a file or at a printer.
    (This is a local print feature.) If the status display is enabled
    when you use the PRINT function, the word Print appears on the
    status line. Your screen refreshes when the printing process
    completes.

    The first use of PRINT in a given run of TN3270 creates a new
    version of the output file. Successive uses of PRINT in the same
    program cause the screen contents to append to the existing file.
    If the output is directed to a printer, each use of PRINT creates
    a separate entry in the printer queue. If the printer is a
    spooled printer, the output is released for printing immediately.

    Use the command qualifier /PRINTER=file to specify where to
    direct the output file. The SET FIL function allows you to
    change the name of the output file each time you invoke the PRINT
    function.