You may want to look at something like Rave Wireless which has those things you would want. Here’s a link
http://www.ravewireless.com/products/ravealert?gclid=CKyYs8qf35oCFQq8kgodIGXtxw
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You can also use the NET SEND command to send popup message to the users. For Windows Vista, you use the MSG command.
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