A zMDIDilogFrame is like a 
zDiologFrame, in that it is bare bones
with no default processing, but can
only be used in Multiple Document
Interface (MDI) applications. 
They look like standard MDI child 
frames in that they are clipped to the 
interior of their parent, can be ionized,
etc., but function as dialogs in that
they can be read from resource templates
and properly handle tabbing between 
controls. These can only be run 
as models dialogs.