WPCS International Inc. is launching a Windows-based application that will provide access to the five most popular Bitcoin exchanges in early 2014. With the company's announcement that it expects the Bitcoin trading application to be revenue generating in mid '14, its stock is seeing a big boost. Plus, after two years of underperforming the market, Jim Cramer likes what he sees in Caterpillar. And the Twitter rally continues as the micromessaging network's stock looks to continue its gains of more than 20 percent on this week. Jonathan Marino at the Nasdaq Marketsite in Times Square.

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