You can't. That's why its a password
You can know the changed password on Gmail. There is a notification that the password has changed. However you cannot see the changed password.
No, you cannot know any person's Gmail password. It is because it is a private property of the person. The person should be aware that it is not public key i.e. the password.
Everyone's gmail account password is different !
well you are putting the wrong password . try putting the right password
You can easily change your password on Gmail. The password is like the key to Gmail account. You can change it in the settings.
That is his private information, not for you to know.
The password at Gtalk is same of Gmail. It is because Gtalk is a subset of Gmail. Gmail is the one that's password is unique.
Hacking is an illegal act, therefor you will never know.
You can use a Gmail's alternative Gmail to retrieve password. The password can be reset via this email account. This is the reason why you need an alternate account.
You cannot find the password with Gmail password. Gmail only shows the various notifications that Facebook receives. It never stores the passwords anywhere.
You cannot know other's Gmail ID and passwords. This is the private property of the individual. The mail might contain information about the person.