How to identify the remote system that gets connected to our

Hi,


I am doing a project which works on providing security.In this my pblem is any user from anywhere and any location if they get registered into our site how can we provide security to them through my website in online from accessing unwanted sites.how can I provide that security using struts and other technologies that work related to struts or basing on struts.


Can any one please do help me in answering this question.As early as possible.


Thanks & Regards
Venkat

please reply to my question ASAP.