using cookies to provide automatic login

Question

hi all,

I have some web applications written in php , all hosted on the same server. for e,g webmail.xxx.mu forum.xxx.mu wiki.xxx.mu

I want to integrate all of them in one webpage like this: *create one webpage (main page) *create one IFrame *create one navigation bar at the top of the main page. *when you click on "mail" it opens in the Iframe , when you click on "forum" it opens in the same IFrame etc *When i sign in into one of the web applications (say mail), I automatically sign in into forum & wiki (am no longer presented with the login in these pages)

can anyone advise if this is a feasible solution and help how can I implement the automatic login ??

Thanks