running in 8086 mode

[CyberPsychotic]

I was coding some kind of emulator like thing and came to the need to run
a piece of binary code in 8086 mode. (no DOS ints. a coulpa of BIOS ones),
I 've read in some book that it could be possble to switch 486 processor
to run certain task in 8086 mode I wonder if that's possible to do this
from within a C code? (actually I don't remember what book I have seen it
in, so I am unable to gather additional information).

 Would apprecciate any hints

 thanks

with best Regards
 Fyodor