Command: get_key
  
Syntax: 
  i = get_key()
  
Description: 
  Return the key that was pressed by the user, without waiting for 
  carriage return. Return -1 if no key was pressed. Special
  codes are returned for the function keys, arrow keys etc.
  
Comments: 
  DOS can hold a small number of key-hits in its keyboard buffer. 
  get_key() will return the next one from the buffer, or -1 if 
  the buffer is empty.
  
  Run the key.bat program to see what key code is generated for
  each key on your keyboard.
  
See Also: 
  wait_key, getc
  
