System:	Standalone	Transaction Processing	Client-Server	Web Site	Web App	Instant Messaging	Napster	Gnutella, etc.	SETI	Groove
Server	(either server or PC)
Custom S/W	X	X	X		X	X	X		X	Groove system, specific apps
Standard S/W	X			X
Computation	X	X	X	X	X		X			X
Data Storage	X	X	X	X	X		X			X
Input	X	maybe	maybe	X	maybe
Output	X	maybe	maybe		maybe
PC	(either server or PC)
Custom S/W	X		X			same for all common users	same for all common users	same for all common users	same for all common users	Groove system, apps are auto down-loaded
Standard S/W	X	X		X	X
Computation	X		X	X	X	X	X	X		X
Data Storage	X					buddy list	XX	XX		XX
Input	X	X	X	little	X	X	X	X		X
Output	X	X	X	X	X	X	X	X		X
Communication	None
PC to Server		dedicated line	LAN	Internet	Internet	coord, relay	coord, search			coord, relay, some apps
PC to PC						X	XX	coord, relay, transfer		X
Anonymous Distributed Server							X	X
Person to Person						X				X