> Eric, the program I wrote, which drew the page fault, uses the int86 in 
> four of the eight functions. the program
> is a mouse event handler, and "micro-gui". I already had included 
> 'dos.h', but I did not realize ther was a 'dpmi.h'!
> I'll have to pry into that header to try to see what exactly it can do. 
> The thing is, djgpp has a nice solid library,
> and I like to stick with something that looks "standard". At any rate, 
> does anyone know of a utility that will stick
> a PE stub on a djgpp, either alone, or in tandem with the MZ stub, 
> insuring dos compatability?--kurt<wb2...@gmail.com 
> <mailto:wb2...@gmail.com>>.

If your program runs in a Windows DOS-Box, but causes a page fault in DOS or 
DOSEMU, then there's a good chance that it erroneously uses a NULL pointer for 
memory access. This is a pretty common error, and AFAIR there is a switch for 
cwsdpmi to disable the "page 0 protection". You can also test with HDPMI's -m 

C:\>HDPMI -r -m

If your program runs in this configuration without page fault, there is a 
"forbidden" NULL pointer usage inside your program.

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