A guy rings tech support to report that his computer is faulty.
 
Tech: What's the problem?
 
User: There is smoke coming out of the power supply.
 
Tech: You'll need a new power supply.
 
User: No, I don't!  I just need to change the startup files.
 
Tech: Sir, the power supply is faulty.  You'll need to replace it.
 
User: No way!  Someone told me that I just needed to change the startup files
and it will fix the problem!  All I need is for you to tell me the command.
 
Ten minutes later, the User is still adamant that they are right.  The tech is
frustrated and fed up.
 
Tech: Sorry, Sir.  We don't normally tell our customers this, but there is an
undocumented DOS command that will fix the problem.
 
User: I knew it!
 
Tech: Just add the line  LOAD NOSMOKE.COM  at the end of the CONFIG.SYS.  Let
me know how it goes.
 
Ten minutes later.
 
User: It didn't work.  The power supply is still smoking.
 
Tech: Well, what version of DOS are you using?
 
User: MS-DOS 6.22.
 
Tech: That's your problem there.  That version of DOS didn't come with
NOSMOKE.  Contact Microsoft and ask them for a patch that will give you the
file.  Let me know how it goes.
 
One hour later.
 
User: I need a new power supply.
 
Tech: How did you come to that conclusion?
 
User: Well, I rang Microsoft and told him about what you said, and he started
asking questions about the maker of the power supply.
 
Tech: Then what did he say?
 
User: He told me that my power supply isn't compatible with NOSMOKE