Easy to find the xp system login password Raiders

When I mention the password, this is a painful understanding. This is a sad past. A small head can't hold a big password, so users often forget the system login password. How is this good? How can this be cracked? A little bit of defense, it was a surprise strike.
Taking the system login user xi123 as an example, two methods for cracking passwords:
First, using the NET command
We know that the net user command is provided in Windows XP, this command can add and modify user accounts. Information, the syntax is:
net user [UserName [Password