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Online tools for monitoring my portfolio gains/losses in real time?
Do you have a broker? Any online brokerage (TD Ameritrade, E*Trade, Scott Trade, etc) offer the functionality that you want. If you're not interested in opening a brokerage account, you can search for threads here related to stock market simulation, since most of those services also provide the features that you want.  If you do you have a physical broker at some firm, contact him/her and ask about the online tools that the brokerage offers. Almost all of them have portfolio management tools available to clients.