Evernote allows "copy link" functionality. This allows any 3rd party application to link to the exact note you have created. We use it with calendar entries linking with the most recent client notes/correspondence.
We also use it with desktop "post-it" notes with "To Dos" linked to our Evernote To Do list where you can tick things off as they are done. We prefer this linking method to simply listing the jobs on the post-it. Why? Because we leave our completed To Dos as another compliance/MI trail. They never get deleted.