I'm working on a project that may have two or three content creators. I would like to be able to notify any of them if the other(s) are logged in. This is to prevent one user from editing a post that another user is working on.
Is there a method to tell who is logged in (I would call this regularly) and if possible what page they are viewing or at it's most basic necessity (what page they are editing)?
Note: I have an application that connects to WordPress through the apps internal browser. If the user logs into through their own browser the changes in the application browser and their own browser start to conflict. One might autosave and write over the other. The reason, if you really want to know, is that the Edit panel is great for writing content. My app writes to the custom fields and title. So I use each for their strengths. But having both open at the same time they over write each others values. So I want to even be able to tell the user using my app that they are also logged in via their browser.