Solve : i want to use 2 yahoo id in 1 pc how can i make it possible??

1.	Solve : i want to use 2 yahoo id in 1 pc how can i make it possible??
Answer» actually once i had visited my friends pc and i found that he can USE double yahoo id in 1 pc so frm that time i'm trying to do it my self but i didnt find any software neither any solution thats why i want to post this question that how can i make it possible to use 2 yahoo id in 1 pc can hav any solution or any software? Can't do it...can only be logged on to 1 yahoo account at a time...Two DIFFERENT BROWSERS can perform this function. I've done it with IE & Firefox, one logged into one account, the other logged into the other account.

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