How to unlock the administrator account

[abpjf]

always have >1 administrator accounts, some would point out that it's a security issue in general to think that way, but for some implementations (like a home media server, vs say, a missile launch facility lol) who cares? I've had to resort to backup admin accounts plenty of times over the years - you never know if the system in question just horks for no specific reason outside of password-attempt locks.