Chapter 2 (b) - Preventing your Startup Files from being bypassed.  

MS-DOS 6 provides the option of bypassing some or all of the commands in your CONFIG.SYS and AUTOEXEC.BAT files. To bypass specific startup commands, press the F8 key when your computer 
starts; to bypass all startup commands, press the F5 key. However, this feature can make some 
password-protection schemes ineffective. To disable this feature, add the following command anywhere 
in your CONFIG.SYS file:
  
switches=/n
  

 