I vaguely remember an extraordinarily configurable (or even programmable?) editor under OS/2 Warp that I found quite impressive at the time. I think it was EPM.

I vaguely remember an extraordinarily configurable (or even programmable?) editor under OS/2 Warp that I found quite impressive at the time. I think it was EPM. Surprisingly, I can hardly find any information about it except on wikipedia and edm2.com.