Program to set on off the caps lock, scrolllock, numlock. 
   
  	#include"stdio.h" 
  	#include"conio.h" 
   
  	void main() 
  	{ 
  		char ch; 
  		char far *memory1=(char far *)0x417; 
  		char far *memory2=(char far *)0x418; 
   
  		clrscr(); 
  		printf(" 
   
  		  'C' -=:=- CapsLock."); 
  		printf(" 
  		  'N' -=:=- NumLock."); 
  		printf(" 
  		  'S' -=:=- ScrollLock."); 
  		printf(" 
  		<ESC> -=:=- Escape"); 
   
  		while(1) 
  		{ 
  			ch=getch(); 
  			if(ch==0x1b) 
  				break; 
   
  			switch(ch) 
  			{ 
  				case 'c': 
  				case 'C': 
  					*memory1=*memory1 ^ 64; 
  					break; 
  				case 'n': 
  				case 'N': 
  					*memory1=*memory1 ^ 32; 
  					break; 
  				case 's': 
  				case 'S': 
  					*memory1=*memory1 ^ 16; 
  					break; 
  			} 
  		}