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Looks a bit like Mac OS X to me, only upside down: menu bar, app bar, status bar.
Phar Lap made amazing DOS extenders.
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I liked DOS4GW better.
This is not Phar Lap’s DOS extender, is kind of an iTerm2 for Windows 3.x
Except that writing a windowed DOS terminal emulator involves writing an entire VGA card emulator, likely a VGA BIOS, hooking a bunch of DOS routines.... probably a DOS extender too.
Sure, but DOS4GW doesn’t do anything of that except the extender part
You still need a DOS extender to do any of those magic things. Drop into unreal mode, or into protected mode and load the interrupt tables.
Like a smell from a cupboard in your grandmother's house, some of these names conjure up strong memories from your childhood.
"Smells like that DOS extender I wanted to use but couldn't afford. The one that was steamrolled into a thin red paste by DOS/4GW."
It goes both ways too—just thinking about K&R C is enough to trigger the memory of the smell of the copy of K&R that I borrowed from one of my high school teachers which was imprinted with the smell of coffee and cigarettes (including a coffee ring on the front cover).
After reading that I now have a sudden craving for 4DOS and 4OS2.

I was young at the time and had “access” to a lot of amazing software packages that I’m still learning how amazing they were. Gotta wonder how things would be different if I didn’t give up on DESQView/X and decided to download Slackware one 1.44mb floppy at a time from a local BBS.

I ran my BBS on OS/2 for a couple years. Loved 4OS2.
Before Windows Embedded was a viable thing we built a product around Phar Lap ETS, which was their embedded RTOS with a Win32-compatbile API.

It was great. A productive, civilized development experience compared to many embedded environments back in those days.

Phar Lap Dos extender.. Now that's a name I've not heard in some time..
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Watcom C compiler or CodeWarrior for Mac