So it's all up to the player.
Real time as in do notifications pop up over the player in need? I don't recall seeing game play that shows that.
Well, there are 2 (possible) reasons why you haven't seen vids that showcase this
1. All the vids released by Bethesda have no HUD, so any notifications wouldn't be visible anyway
2. they may only be audio ques, and not audio and visual.
Example of what I'm talking about can be seen in the Dev Diary #3 vid - http://www.youtube.com/watch?v=gtBkNk6b7GI
0:34 - you hear a teammate say what sounds like, "droppin a command post!"
1:09 - "standing guard at primary"
1:20 - again, "droppin a command post!"
1:48 - teammate says "I need ammo here"
1:58 - "moving to secure primary"
2:11 - "turret deployed!"
these are all examples of notifications that will happen automatically - things that players would usually need voice chat for.