What type of icing is utilised on cookies that seems so smooth?

Question by Pinkadot: What type of icing is utilized on cookies that looks so smooth? I want to make some great sugar cookies and when I see pics of "gourmet" ones, the frosting is often perfectly smooth... what kind is it and how is obtaining the "smoothness" accomplished? I must have identified, I guess. I have utilized Royal icing with cakes... Very best reply:
Response by Celia L
I have primarily noticed royal icing utilised on sugar cookies, it dries "difficult" and glossy. Here's a couple of concepts: http://allrecipes.com/Recipe/Sugar-Cookie-Icing/Detail.aspx http://www.ehow.com/video clip_2369260_ideas-generating-smooth-vanilla-icing.html
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