Yes, As Dan suggested I wanted to keep the session alive only for one page in my application, where the user will take longer time to fill out the forms.:)
Presently i m using window.setInterval and calling a function which in turns calls .cfm page and it works fine.
Just wanted to know whether we can same kind of function in coldfusion.
CFSCHEDULE- good idea, but my customer is not preferring this one.
Thanks all for your replies.