I have a few computers on my personal home network, they are all running on windows xp pro. There are times when I will need the user at a specific computer to contact me, and I would like to be able to send a pop up alert to the user on that computer. Assuming that they are NOT running any kind of program such as AIM or MSN messanger, I have two questions, 1. How can I make an alert popup on a specific computer, so that the alert says what i need it too.? 2. How can I send a general alert to all three computers if I need to saying the same message but only to computers within my own network (I don't want to broadcast the message to the entire net. I am also connected the internet via cable right now, but they have one ip addres and my internal has another.) Is this possible?