I want a database resiprocal link excahange system with subscriptions feature. When a webmaster subscribe for the link exchange program, he or she need to install some "code" on his/her link page, the "code" will automatic create a list of link partner(from the subscription database) on the link page. Since the link partner database grow when a new webmaster subscribe for the program, the link page must be able to reflect this automatically. It is very important that all the link created by the "code" must be search engine friendly, which mean that all link must be able to crawl by major search engine(Google, Yahoo, MSN and ....) so that the link exchange program make sense. Since different website has different hosting, the code basically divided into 4 category which is PHP, ASP, ASP.NET and Perl.