If you really want to understand, there is an excellent (very well written) white paper here: http://images.globalknowledge.com/wwwimages/whitepaperpdf/WP_Mays_Ping.pdf Here is the summary -> Ping (Program on the application layer) -------> Opens a 'raw' socket to IP Layer ------> IP layer (Layer 2 on OSI) packages ICMP packet and sends it Since ...
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Best way to get a hotel quick I always use Priceline when I need a hotel (both planned and unplanned). This app allows you to get great rooms at a reasonable rate. Easy and fast to use app I like  name your price but the app needs to add the package feature that is available in the website version.