I have a Problem with my OLE Server.

Problem description:

I have an OLE server which is my own application (VC++ MFC).
It will be lunched in the MS Power Point, which is my OLE container.
How can I notify my container (PowerPoint) that something was done
(changed) in the server(my App)? I was thinking about Connection
Points but I'm not sure whether this will work. Can anyone tell
me what is the solution? How can I add Connection Points to the
simple application template generated by the MFC App Wizzard
(full server option)?

Thanks in advance!!!