Evaluation of Proxying
-  Application level gateway
 -  Depends on specialised client programs or user procedures
 -  Can also work transparently with a help of a router 
transparent proxy
 -  Sometimes also associated with caching (e.g. ftp, http)
 -  Most web clients provide built-in support for proxying
 -  Some services (SMTP, NNTP) are by default designed to work
with proxy-style gateways
 -  Proxy technology examples:
	
	-  SOCKS
	
 -  TIS
	
 -  Microsoft Proxy Server