Community Tip - Did you get called away in the middle of writing a post? Don't worry you can find your unfinished post later in the Drafts section of your profile page. X
There is Mathcad Prime and there is Mathcad Prime Minister - see http://communities.ptc.com/thread/39935
There is Mathcad Express and there is Mathcad Espresso!
What is it!? See the picture: