How can I allow only certain email addresses?

How do I allow two email addresses to log in to the same Salesforce.com account?

I am a Graduate Assistant who runs my professors Salesforce.com account (along with LinkedIn and every other campus program we use.) I want to log into his account with my email/password since there is the classic IP address problem on Salesforce where it sends an email to him every time I try to log in.
Answer:

You cannot log into another person's account using your account details. Each account is generated for a specific person and can only be accessed by a particular person. On the other hand, if you have a joint account, it could be easy as you just use the given email and password. If you want to enter his account, you may have to request his email and password.

GarrettHamblen at Ask.com old Visit the source

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