HI....

Web Based Server : its a 3- tier or n-tier arcitecture
                   Here the Browser is the monitoring level
                   All Internet web pages are WBS.
                   P'gmming is done using Java..J2ee..Java  
Script
                   Once u open ur browser n type in the req 
site...ur request would be sent to the server using TCPIP...
                   We call WBS a 3-tier archi coz u have 
browser ... the servr..n the back end.

Client Based Server : its a 2- tier arcitecture
                      Here the Front End is the monitoring 
level
                   All Stand Alone Applns are CBS.
                   P'gmming is done using VB.Net
                   Here u dont need to type anything...the 
appln is installed..jus click it.
                   We call CBS a 2-tier archi coz u have 
browser ... n the back end.

The back end is usally Oracle.

web based server:
1.no.of users high.
2.used HTTP,FTP protocals.
3.think
4.in web server use URL(address)
5.develope web applications use ASP,JSP,JAVA SCRIPT,HTML
6.business logic is on server side
desktop or client based server:
1.no of users less.
2.used HTP/IP protocal.
3.thick
4.in client server use EXE(address)
5.develope client applications use JAVA SWINGS,VB,ORACLE 
FORUMS.
6.business logic is partial on your client side.