INVISILAN

COMPUTER NETWORK SECURITY UNIT FOR ATTACHMENT TO AN EXISTING COMPUTER NETWORK, NAMELY, A COMPUTER HARDWARE CONTROL UNIT, PERSONAL COMPUTER (PC) INTERFACE BOARDS, A COMPUTER COMMUNICATIONS GATEWAY INTERFACE BOARD, AND ASSOCIATED FIRMWARE FOR USE IN NETWORK SECURITY APPLICATION AND MANAGEMENT; AND SOFTWARE FOR USE IN NETWORK SECURITY APPLICATION AND MANAGEMENT, ALL SOLD AS A UNIT