I'm not sure if Yahoo messenger has the specific ability to log in to two accounts simultaniously. If you don't mind using another client to log into your Yahoo account, there are a lot of third party messaging clients (Trillian, Pidgin, Spark, Meebo, etc) that will let you log into multiple accounts at once. These will also let you sign into other protocols such as AOL IM, MSN messenger, ICQ, IRC, Yahoo IM, and several others.
If you're open to trying a new client, I'd recommend trying Pidgin:
http://www.pidgin.im/download/
Its probably one of the easier clients to learn to use.
If installing new software is an issue, use one instance of Yahoo Messenger and a web client like
https://imo.im/
Please leave feedback if this was helpful. Thanks.
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