How i can retrieve the cookie of an authenticated session.?

Hi everybody,

i have created a php class that allow me to authenticate to the API REST in order to retrieve some information about a process. One of these information is the tasks that users has.In order to access to the form of a task, i retrieve the ActiveInstanceId and then i put it in a simple link, like follows:

`$AIID=$resultatsTasca[$i][id];    

<a href=http://localhost:8080/bonita/portal/homepage#?id=$AIID&_p=performTask&_pf=1>NameTask</a>
`

the issue is , when user do click in this link , if it does not logged previously , then is showing the Bonita Porta login page, if is yes , then it shown the form of task .

So, how i can get the cookie of an authenticate session?

regards!