In the WebPosition keyword box, type in the keywords or keyword phrases EXACTLY like you think the user would enter them in one of the search engines to find a site like yours. If you wish to simulate the user doing an exact phrase search, surround the phrase with a double quote (") character. Place each search on a separate line. Therefore, 10 lines will perform 10 different searches across each search engine you select on the Engine tab. Doing this by hand would be next to impossible, but WebPosition makes it very easy.
For example, you could tell WebPosition to search on both:
Boston real estate
"Boston real estate"
You'll find that you will likely rank differently on each depending on the design of your page and the engine. Most search engines will find the exact phrase search on your page ONLY if the words "Boston real estate" appear on your page with those three words all together. Therefore when designing pages, it's important to integrate the most likely phrases people would use to find a site like yours into your page's text. Without the quotes, most engines will simply look for a page that happens to contain all of the above words and put the so-called best matching or most "relevant" pages at the top of the list. Which will the user type? The more experienced Web users will try to do an exact phrase search first. Then they will try an inexact search if that doesn't yield any good results. Novice users may not know to use the exact phrase option unless the search engine defaults to that.
Advice: Monitor your positions for both.