Site - Start process and tasks

Hello,

I have a site with an interface page as content. My interface nested other interfaces and the navigation through all interfaces is based on the logic of local variables. However, in some interfaces I use "a!processTaskLink" to run tasks on already started processes. My problem is: I want to open these tasks in the same tab and when I finish my task, I want to go back to the interface where I was. But, the actual behaviour is that when I finish my task, I go back to the main interface because the values of local variables are lost.

Does anyone know how to get around this problem?

Thank you.