DDE message to make Netscape open URL
To those who want to do an WWW_OpenURL to Netscape, this seems to work:
Author: David Krauss

Text1.LinkTopic = "NETSCAPE|WWW_OpenURL"
Text1.LinkItem = Text1.Text & ",," & -1
Text1.LinkMode = 2
This assumes you have a Text1 control for entering the URL. The -1 is the key to not opening a new window every time.