IMHO, it would be extremely difficult, to hack.  Without access to the
actual data used to paint the window, intercepting the WM_PAINT message is
useless. Then there's the possibility that some ill behaved programs paint
outside the WM_PAINT.  Windoze's very own edit control is a nice example of
this.  I concede that it would be possible to hack MPLAB to discover where
and how the data used in the register window is stored ( many with talent
beyond me have done that very thing to Windoze itself ), however, those
with this much talent and time are probably writing their own simulator
<g>.

BTW, I wouldn't think that individual messages are sent when a register is
changed.  More likely register data is stored in some type of structure and
when that structure is changed a call to InvalidateRect(..) is made to
force a repaint.  If individual messages were used, it might make it easier
to intercept and maintain the status of registers outside of MPLAB.

On Saturday, August 07, 1999 12:35 AM, Mark Willis
[SMTP:mwillis@NWLINK.COM] wrote:
> Everything's done with messages in Windows, basically;  You send a
> message to the File Register Window, telling it to change subwindow RA
> to 0x49 (or whatever), IIRC you can intercept those messages, but it's
> hard to do so without being part of that application (I'd have to go
> look to be sure, it'd be easiest if Microchip did this as this sort of
> thing's always simple with source code access & a *bear* without that.)
>
> For Microchip to create a customizable LED-ized Register window would be
> not too horrible, I'd think, and hiding windows is certainly simple
> enough for those who don't use that window <G>  Not that hard to wrap
> our brains around reading hex, either, though.
>
>   Mark
>
> Jim Hartmann wrote:
> >
> >        Any windows programmers out there know if it is possible to
> >        capture window repaint data?  If it is then repaints to the
> >        File Register window or Special Function Register could be
> >        intercepted and made to do something useful like light up
> >        simulated LED's or what have you.
> >
> >        -Jim