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MS Windows only, at this timeThis API allows you to discover UPnP compliant Internet Gateway Devices (Routers/Boxes) on the network and dynamically manage their ports.
Requirements:
Note: All functions are synchronous and wait response from the device. During 
that time, the application is frozen.
_UPNP_Connect is the worst freezing function (3-5 seconds), the others work much 
faster if the device responds immediately (which is not always the case).