new window manager to the login
 

Any one know how to add window managers as alternative options on the desktop login?

I've man'd and googled and grep'd.

I've tried one method found online creating files in //usr/dt/config/Xresources and such
but had no luck. Most info. i can find seems very old so am doubtful about it
seeing how 10 has moved on so much.

/usr/dt/config is still the way to go with Solaris 10. CDE hasn't that much evolved since many years and is now slowly dying. You may want to have a look at blastwave's enlightenment_dt package as it is doing the required steps to integrate this window manager to dtlogin.

You also have the alternative of replacing dtlogin with gdm2.
Under a command line (console) session:

Or with recent Solaris Express:

Then, use the gdm2 way to add a window manager.

Actually I've been using it for the last few weeks and I'm
really starting to like it.
It's actually a lot more powerful than I ever gave it credit.

CDE was certainly amongst the leading graphic environments ten years ago, and I was one of its supporters at that time.

I'm more happy with icewm (if memory is sparse) or JDS/Gnome otherwise nowadays.

I don't relly like gnome or kde much.
I've tried but they just suck up so much CPU they get on my nerves.
I always end up back with a nice simple fast GUI like fvwm or windowmaker

Besides, they make you lazy.