struct interface_msn *ifmsn; /* link to interface msn list */
struct interface_screen *ifscreen_in; /* link to screening list */
struct interface_screen *ifscreen_out; /* link to screening list */
struct interface_msn *ifmsn; /* link to interface msn list */
struct interface_screen *ifscreen_in; /* link to screening list */
struct interface_screen *ifscreen_out; /* link to screening list */