Add an admin account with password “123abc”:
net user Frank 123abc /add
Make the account administrator:
net localgroup administrators Frank /add
Add a domain user to the domain administrator group
net localgroup administrators domainname\Frank /add
Activate the hidden administrator account:
net user administrator /active:yes
Change password for the hidden administrator account
net user administrator *
Activate the guest user account:
net user guest /active:yes
Create a new user without a password:
net user Frank /add
Change the password of a user:
net user Frank 123abc
Delete a user account
net user Frank /delete
You will have to manually delete the user folder after deleting the account.