But hasn't the form already moved and resized by the time we get those
events?  I tried changing the location in these events and it does move to
the right position, but I see it move to the other position first.

I am considering catching the WM_WINDOWPOSCHANGING message and setting the y
coordinate to my desired location before it gets processed by the base.  I am
not sure I can programmatically prevent the taskbar grab line from showing
when my window does not take the whole screen and I would prefer not to
disable it for the whole system (maintenance guys do use other apps).

Setting the MaximumSize and MinimumSize do not lock the window in position.  
Changing the autohide property to false and applying it still moves my
window.  

I can't prevent the user from grabbing the window by overriding the WndProc
and stopping the WM_NCHITTEST from responding because the taskbar is not my
code (am I not understanding your suggestion?).

I have been able to prevent the moving of my window by overriding the
WndProc and resetting the location to what I desire before passing it back on
along the message path.   The grab bar is still there and shows the task bar
when grabbed.

However, I think I actually want to hide the grab bar.  I can
programmatically hide it, but I think I may have some problems because we
have several apps and since we don't have a keyboard (touchscreen) it can be
difficult to get the taskbar back if the apps don't shut down properly.

The only way I have been able to hide the grab bar, is with an application
that takes up the full screen and is not resizable (which is the way our apps
used to work).  Now we have a single navigation app that takes the top of the
screen and multiple apps that sit below it.

Thanks for your help,

Ken