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The Pop-up Blocker feature in Microsoft Internet Explorer 6 for Windows XP Service Pack 2 (SP2) protects users from malicious activity that is often hidden behind or initiated by pop-up windows. Designed to give users more control over their Web browsing experience, this feature is on by default, and blocks script-initiated pop-up and pop-under windows that launch automatically from a Web site.
Block trading is a useful measure for analysts in order to assess where institutional investors are pricing a stock. Because in a merger or acquisition, a bid needs to clear the market (i.e. enough shareholders need to tender), it is most useful to see at what prices large blocks of stock are trading.