21B3 INT 21 - VIRUS - "Requires" - INSTALLATION CHECK 21B300 INT 21 U - Novell NetWare - CHECK LIP/PACKET SIGNING/IPX CHECKSUM SUPPORT??? 21B301 INT 21 U - Novell NetWare - CHECK SIGNATURE LEVEL??? 21B302 INT 21 U - Novell NetWare - START PACKET SIGNING 21B304 INT 21 U - Novell NetWare - SET SIGNATURE LEVEL 21B306 INT 21 - Novell NetWare - RENEGOTIATE SECURITY LEVEL