thaknx for ur reply dear.
i knw it can b done with asp.net application. but see prob is this my programe is alredy working there on lan. now wen il make this application in asp.net how can they get connected on net and can see the updated information anytime they log in. i was thinkg that for internet the server shud b webserver only. then only ur lan and internet can get the data same time. wat do u say abt this. can u xplain me the infrastructure i shud make for this application ?