All these unattached vertices

[DaemonGrin]

I am modifying a couple vanilla meshes like making a vault small hall 1 way dbl window and I noticed there seem to be a lot of vertices not attached to anything. Why are these there?

 

Another thing in Nif and Geck the dblwin hallway piece looks perfect but ingame it gets all jacked up around the window. All I did was duplicate the windowed side of the hall and replaced the plan side with the duplicated side.

 

 

 

Thanks,

Geoff