If you mean to render as a wireframe, select the wireframe option you want to display (such as in lowpoly's example). Note that you can choose to have the whole scene displayed in wireframe, which will probably be visually confusing, or only a selected figure or prop. Then choose anti-alias from the render menu - don't actually render.

If you want to render larger than the preview window, then make a "movie" with only a single frame, and choose the appropriate settings.

I can only be vague about the exact procedure since I'm currently teetering on the brink of buying Poser 9. However it can be done in earlier versions and I'm sure the ability hasn't been taken out.