How to get message in realtime sent by another user using FM TH_POPUP?

Question

I want to program a chat function between two SAP users by using ABAP.
1.User A send a message to user B by using TH_POPUP,
  At the same time, the message is showed in screen as 
  'Send message'
2.User B get the message
->My problem is how to get the message in realtime which I want to show it in screen as 'Received message'.
Can anybody tell me how to get the message sent by using FM TH_POPUP in realtime?
Edited by: Jing Yu Huang on Feb 6, 2008 2:11 AM

Answer 1

Hi there
This really isn't a "conversation" type program
1) What does the original user do after sending the message -- I'm not sure if there's a WAIT_FOR_REPLY and even if there were I'm not sure  you'd want the original user to have a suspended session waiting for a reply.
2) What does the 2nd user do after receiving the message --if it's just thrown up on his screen  then there isn't any mechanism to return a reply from USER A'S SESSION.
You need somehow to have a continually running process which will send a message for example to user B and create an event or do somethimg so that User B is bound to the same session that sends the original message.
2 different users running the same abap don't actually have any common link between them even on remote function calls.
You need to have a central process here that shares a message space between the users (i.e a kernel type module).
Classical Abap won't do (nor is it designed for) these types of processes.
You might be able to find something in some of the  'C' coded kernel calls but as I previously posted before you are far better off using Windows for this type of stuff. (Windows Messenger for example).
ABAP unfortunately is not designed as a multi user  "re-entrant"  programming language - nor was it intended to be.
Another possible get around is to use the workflow system. User A sends a message which raises an event. This then starts a workflow which transmits say message to user B and notifies him of a message waiting for him. User B can reply which again raises an event and triggers workflow routing the message / reply back to user A.
The response time won't be very good but at least it will work without tying up 2 user dialog sessions - but seriously guys I'd give up on this and just use Windows Messenger or equivalent system.
These type of programs depend on a central server for the message handling - you'd have to replicate this in ABAP -- and Im 120% sure it can't be done.
Cheers
Cheers