"Do it" notification when two process comunicate

I have two processes wich comunicate as follows : When process_1 ends (done by Actor_1), process_2 starts (By actor_2). My problem is, once in the portal, actor_2 must Launch process_2 to get the information sent by process_1 and can start process_2, So he doesn't find "Do it" Notification as when two tasks executed by two diffirent users , comunicate in the same process.

To resume i want that actor_2 get the notification "Do it" , and not be oblige to start process_2 manually !

Thank you