Title: Screening External Access Link(SEAL) Introductory Guide 
Authors: SEAL Consulting Services    
File name:pubdoccommercialsDECseal_intro.ps.Z  
File size: 158032 bytes 

Abstract: Introduction guide to SEAL.  SEAL is short for
Screening External Access Link, it is a system of computer
hardware and software configured to provide a highly serviceable
link between a private network and an internet another network
that is not necessarily trusted. The SEAL consists of three
systems, known as gatekeeper, gate and mailgate.