For more about the redirector interface specifically, look up the sub-functions of AH=11h and AH=12h of INT 2F. Originally undocumented, this blog article mentions why they were designed the way it is.

Do not forget Ralf Brown's Interrupt List ;-)

For those who wonder:

http://www.ctyme.com/rbrown.htm

I always preferred TASM than MASM.

Seconded :) But maybe that's because I used Turbo Pascal and Turbo C++! Just before discovering (and buying) the Watcom compiler.

zura, spot on.. so did I.. till things became a bit difficult after Borland started to implode and Win 9x reached the endzone.

for the new folk exploring TASM == http://en.wikipedia.org/wiki/Turbo_Assembler :-).

wow, this whole thread coupled with the recent one on PE format has resulted in a serious trip down the memory lane for me personally.