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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.
Randomized Block Designs. The Randomized Block Design is research design's equivalent to stratified random sampling. Like stratified sampling, randomized block designs are constructed to reduce noise or variance in the data (see Classifying the Experimental Designs). How do they do it? They require that the researcher divide the sample into relatively homogeneous subgroups or blocks (analogous to strata in stratified sampling). Then, the experimental design you want to implement is implemented within each block or homogeneous subgroup.