🚀 go-pugleaf

>1. How can I compile a file that will run under DOS, Windows and OS2?
>  I would like to include EGA resolution graphics with color.  The
>  program also includes BIOS calls.  I set the compiler flags -G2 -Lr
>  -AL(plus many others) and then tried to use the BIND command, but it
>  gave me an invalid executable file error.

        Compiling ONE file that can run under DOS, Windows and OS/2, would
        take some doing and would be very difficult if not impossible if
        you're working with the various Presentation Manager Flavors.
        As far as full-screen programs go (which I assume you are working
        with right now), to write something that would work in OS/2 and DOS,
        you need to use only Family API functions in your program in order
        to use the BIND command, and then you would run it as a DOS program 
        in Windows.  You cannot use BIOS calls (at least the ones that you're
        used to using in DOS) in OS/2, you must translate them to API functions,
        and their ilk if you want to program in OS/2.

>3. Is Emacs(GNU flavor) available?

        Yes, it's available by anonymous ftp on isca.icaen.uiowa.edu,
        they also have several OS/2 binaries and source in a directory
        something like /pub/os2...

>4. Can the OS/2 DOS box be run in a window instead of full-screen?

        As far as I know, you cannot run the OS/2 DOS box in a window.