how can I set a dde hotlink

I'am currently using BCB 5.0 to build an DDE client application which must
communicate to a BC5.02 DDE-server app.. Does anybody know how to set the
dde-items to be hotlinks instead of the apparently default warm links?

I can use the TDdeClientConv->RequestData to fetch new data from server, but
I am never notified when an item's data changes.

/Karsten