Thanks for the update. In terms of controlling the GroupWise client (i.e. to display the native GroupWise dialogs), you would generally use the GroupWise Token API. Have a look at:
You are probably already aware of this, but the best (and probably only) place to obtain GroupWise API support is via the moderated Usenet Forums hosted by Novell. You’ll find links to those from http://developer.novell.com.
I hope this helps.