Thanks alot!

I tried using it in its most simple way:
Code:
#include <dos.h>

void pokeb (unsigned int segment, unsigned int offset, char value);

int main() {

  pokeb (0x760F, 0x00AE, 125);

 return 0;
  
}
(From the 2nd link)

But when linking this error occurs (Borland C++ 5.5):

Error: Unresolved external 'pokeb(unsigned int, unsigned int, char)' referenced
from C:\WINDOWS\DESKTOP\UNTITLED.OBJ

Do I have to link it with another file or something?