|  |     
    Not sure about the question. Remember, these are windows on a bitmapped
    workstation with a graphics processor and not all windows are terminal
    emulation windows . Where a terminal emulator supports REGIS, etc.,
    those commands are likely translated into lower level Xlib graphics 
    routines.
    
    In the X environment you have
    
             Xlib
             routine
             calls           Requests
     Client  -------->  Xlib -------> Server -->Common -> Output ->monitor
             <-------        <------            Driver    Driver   (window)
             Xlib/server     Replies
             messages        & events
    
    where a client could be a terminal emulator, Xclock, xtrek, etc.
    
    Refer to the "VMS Decwindows Technical Summary" and "VMS DECWindows 
    Device Driver Manual". If you want to write a device driver, there
    are code examples around, particularly on the MIT release tape.
    
    Hope this helps, though I probably did not answer your question.
    
    clay
    
 |