Conductive materials, IE metal stop electromagnetic waves. That's why your cell phone won't work in an elevator. (That bull shit product "internal antenna".. I can even use my cell phone in an elevator... Yeah.. maybe a wooden one.) Any way, windows would let EM energy out of the machine, but only a small amount. It's not really as big of a deal as people think. Your blender puts out more EM power then a computer. If you take all the energy your computer draws, take away all the waste heat, you're left with next to nothing to produce EM with.
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