title: Queries about DDE communication under Powerbuilder
body: <p>I have a third party tool that can send or receive DDE pokes.  I have been using DDE spy to monitor communications between it and a 3rd party DDE server emulator, with a view to replicate this using Powerbuilder.  As far as I can tell, this is using warm links.  I tried using openchannel, followed by execremote, but the type of call is described as 'execute'.
  Likewise, when the client and the emulator start up, they appear in the list of registered servers, but my application doesn't/
  I considered using user32.dll, but I understand that most of the DDE calls won't work with Powerbuilder since PB doesn't support callbacks.
  Can anybody point me in the direction of information on this area? 
  .....
  After a bit more tweaking, I tried opening a hotlink. Clicking the 'poke' button on the application, my powerbuilder has the hotlinkalarm event triggered.  I can pick up the source etc, but no data.  Also I need to send an instruction back, but all respondremote will do is send true or false.
  I have some Delphi / Pascal code from the DDE emulator, but the DDE calls look rather different to the Powerbuilder ones.</p>