Vista - using .Net DirectoryEntry to enumerate domains

I am using the DirectoryEntry class to enumerate all the workgroups on a network (there are only two). Pretty simple VB code.

Dim de_domain As New DirectoryEntry()
de_domain.Path = "WinNT:"
For Each domain As DirectoryEntry In de_domain.Children()
.....
Next

It works well. In the future I will be taking this program into a network environment using a domain server, rather than workgroups. I want to be prepared for that. My question is: will the same code enumerate the computers on a domain server network?

According to Microsoft documentation the Path property is useful to:

"Discover all domains on the network. For example, 'WinNT:' The domains can be found by enumerating the children of this entry."

But networking has never been my strong suit and I am not sure if I should take that statement at face value. WinNT: is not a codename for Workgroups is it?