The External View panel allows you to bring up all the data about a region from the UCSC server, if it is an organism that UCSC curates. While you can access information on a very large regions (spanning 10-15 genes), a smaller region or specific gene may return more data due to more details being available. As a caution, the larger the region in the inquiry, the slower it will be to load the information. Every time you move to a new area, you will need to click the update button (red box). Although the view is not interactive, you can get interesting details about a gene/region, including cross species comparisons, mapped ESTs, SNPs, and/or repeated sequence data, when available.
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