1. how do i issue an interrupt within an interrupt
2. i read omewhere it cant be done .if true why?
3. i tried changing registers directly(eg. _AX=0x3d;)
and then calling the required interrupt function(eg. (*int21)(); ) here int21 points to the 0x21 int. vector.
but it didn't work possibly because the changed regidters affect the rest of the program
4. if you advise me to copy back the reg. values please specify how?