1)To See all the account present on the computer

>Net user

2) To change the password without knowing the old password.

                >Net user administrator *

3) To make a new user account.

                >Net user hacker /add

4) To Delete the Existing user account.

                >Net user hacker /delete

5) To make a hidden account in computer.***** { Works only in windows XP}

                >Net user hacker /add

                >Net localgroup users hacker /delete

     Note: - To login to this Hidden Account Press.

 Ctrl + Alt + Delete + Delete

 And give the hidden user name in the user name field and password respectively.

 And the above are to be executed in command prompt. And the hacker indicates the respective user name. Or the name of the account.