How to know the password for domain admin user?

why don't you just reset it so you know what it is?

What I'm trying to say can  I protect myself by adding a hidden user or a software told me if the  password has been changed, and what is the password? Alternatively, is there a command to find out the password for the administrator in the domain? On the other hand, to know the password without change the password.

Yes, there are ways of revealing the password for the Administrator as well as resetting it... but I would like to know why you need to reset this, if you do not know what it is?  

I am personally not privy to revealing how to hack into the Domain Admin account when security rules prohibit it.

Please explain more.

it is against EE's terms of use to provide you with information to circumvent your network security.

How can I test my security? I know that is locked like a hack lesson, but how I now the holes' security in my system? If one of my employees left and change the password, and I don't have an access to my server?

As I see that I can change the password by using a bootable CD like the following:
http://www.tech-pro.net/howto-lost-administrator-password.html
However, how to reveal the password for any user?
I can change the password by a bootable CD like "ERD Commander" from Lock Smith, I don't remember the name, but again how to reveal the password?

What I understand it from all of you that there is no-legitimately way to reveal the password, but with a certain kind of tables, we can reveal the password for domain admin user account. Moreover, there are websites can help me in this matter, but it will be no-legitimately. Therefore, can someone provide me one of these websites.As I know that some software will check the SAM in the active directory, and show the password, but I don't need it, what I'm asking can I now the password or change it without using a bootable CD?

Thanks.