Monoprice PID 8742 Wireless 802 11N Router with Internal Antenna and WPS Function 2T2R MIMO 300Mbps - Manual (Page 51)

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With the UPnP (Universal Plug and Play) function, the internal client computer can request
the router to process some special port switching, so as to allow an external client to use
the resources of the internal host.

Enable UPnP: Click the checkbox to enable the UPnP.
NOTE:
This function is enabled with Windows XP, Windows ME, and later, when using
Direct-X 9.0 or later. This function is also enabled when using software that supports
UPnP.