need help with v86 mode

hi. i want to write a multitasker for dos. i wrote some programs that
enter PMode and do some stuff but i understand that in order to emulate a real mode environment under PMode i need to use this v86 mode.

1.can somone tell me how this works?
2.is it possible to load and run real mode programs from memory locations outside DOS conventional memory while in v86 mode?
3.anyone knows where to get some good reference material for v86 & OS programming?

thanks in advance.