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Was never built into any version of Windows I am aware of. It may either have come as an add-in app from your ISP, or from your MODEM software. There also may be an app out there that does this. I am betting on your modem software. Check out the disk and see if it's XP compatible, or try for an update. Also V9.2 modems, if you are connected to a V9.2 node ( not too many) allow you to do this, ie have a call come in ( call waiting on) and ask to take it. Modem will hold connection for a few minutes only.
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