I'm kinda new to apex, and im fairly stranded. Trying to basically create a trigger that on the completion of a log a call task, reads a particular field, and updates status based on it. More specifically, I'm not sure if what i want to do is possible.

To update  the lead shouldn't be too difficult. I would just run a SOQL on the lead Id and update the status field. I do this all day long from the API. The problem I'm really having is how to get information out of the current task. That is, how do i know what lead and what the contents of the tasks field are. 

Any help or direction would be much appreciated!