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Just need a little help here...

So... I've created a wall texture that has a window in it (repeating) ... I want the sun to reflect off the glass in the window, so i've added an alpha channel that covers the glass in the windows. I've saved this as a 24-bit TGA and dragged it into VTEX.

What commands do I use in the VMT to make use of this specular mask and make the texture shiney?

Thanks
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