Hello,
its me again 
(2nd time so i think i make great process in learning UE4)
Now im on the networking part…
Many peoples have problems with networking, but in most cases not me.
I just didnt get how the server can identify what client is sending a request or to what client the server has to send something:
Example:
[Messag]
John: Hello
Mark: Write me a Private message
------- Basic multiplayer chat, done already
John: /p Mark Hello
→ Now this message should only be displayed for John and Mark like this
You whispered to Mark: Hello
→ John whispered to you: Hello
Question in short: How can i send stuff like messages only to one client and not globally ?