How to recognize a telnet session (RF) from a SAPGUI?

hi guys,
i must check and block a transaction, developed for a RF terminal, if it is executed by SAPgui...
how to, in abap, recognize a telnet session (RF) from a SAPGUI ?
I have tried FM "SAPGUI_OBJECT_ID" hoping in a sy-subrc ne 0 with telnet but it's not right.
Edited by: Cacco Andrea on Apr 28, 2009 2:43 PM

i resolved like this:
    cl_gui_frontend_services=>get_computer_name(
      changing
        computer_name        = zterm
      exceptions
        cntl_error           = 1
        error_no_gui         = 2
        not_supported_by_gui = 3
        others               = 4
    if sy-subrc = 0.    "SAPGUI
else.               "telnet
    endif.

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