7AFF01 INT 7A - IBM PC3270 EMUL PROG v3 - INTERNAL API INITIALIZATION
7AFF02 INT 7A - IBM PC3270 EMUL PROG v3 - INTERNAL API TERMINATION
7AFF03 INT 7A - IBM PC3270 EMUL PROG v3 - INTERNAL API INITIALIZATION
7AFF04 INT 7A U - IBM PC3270 EMUL PROG v3 - INTERNAL ???