Can OpenGL Render handle (semi)transparency of an object? Update:  Success with the translucent object under the emitting skydome!  

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I want to make an object glassine, mostly transparent.  Maybe add some partially reflective coating on the top.  Is the OpenGL Render able to do this?

I'd love to try it myself first in order to find out, but every attempt I've made to (a) make something any-alpha at all ends in failure when rendering in OpenGL, and (b) whenever I try to render using anything else, like Cycles, I get no output at all, or the skybox texture isn't rendered at all.  And still no translucency.

Can someone show me how to take a cube (inside of the skydome I've already got), and make it half transparent?  And render okay?  Seems simple, but nothing's simple in Blender.

Thanks for any help.
Her is whay I tried, but I don't know about your dome...