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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.
A block is the âcurrentâ part of a blockchain, which records some or all of the recent transactions. Once completed, a block goes into the blockchain as a permanent database. Each time a block gets completed, a new one is generated. There is a countless number of such blocks in the blockchain, connected to each other (like links in a chain) in proper linear, chronological order. Every block contains a hash of the previous block. The blockchain has complete information about different user addresses and their balances right from the genesis block to the most recently completed block.