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    <p>These Wikipedia pages may help add perspective to learning about <a href="https://en.wikipedia.org/wiki/Concurrency_%28computer_science%29" rel="nofollow">concurrency</a> and <a href="https://en.wikipedia.org/wiki/Concurrent_computing" rel="nofollow">concurrent computing</a> for designing an <a href="https://en.wikipedia.org/wiki/Ajax_%28programming%29" rel="nofollow">ajax</a> <a href="https://en.wikipedia.org/wiki/Web_application" rel="nofollow">web application</a> that either <a href="https://en.wikipedia.org/wiki/Pull_technology" rel="nofollow">pulls</a> or is <a href="https://en.wikipedia.org/wiki/Push_technology" rel="nofollow">pushed</a> state <a href="https://en.wikipedia.org/wiki/Category%3aEvents_%28computing%29" rel="nofollow">event</a> (<a href="https://en.wikipedia.org/wiki/Event-driven_architecture" rel="nofollow">EDA</a>) <a href="https://en.wikipedia.org/wiki/Category%3aMessage-oriented_middleware" rel="nofollow">messages</a> in a <a href="https://en.wikipedia.org/wiki/Message_Exchange_Pattern" rel="nofollow">messaging pattern</a>. Basically, messages are replicated out to channel subscribers which respond to change events and synchronization requests.</p> <ul> <li><a href="https://en.wikipedia.org/wiki/Category:Concurrency_control" rel="nofollow">https://en.wikipedia.org/wiki/Category:Concurrency_control</a></li> <li><a href="https://en.wikipedia.org/wiki/Distributed_concurrency_control" rel="nofollow">https://en.wikipedia.org/wiki/Distributed_concurrency_control</a></li> <li><a href="https://en.wikipedia.org/wiki/CAP_theorem" rel="nofollow">https://en.wikipedia.org/wiki/CAP_theorem</a></li> <li><a href="https://en.wikipedia.org/wiki/Operational_transformation" rel="nofollow">https://en.wikipedia.org/wiki/Operational_transformation</a></li> <li><a href="https://en.wikipedia.org/wiki/Fallacies_of_Distributed_Computing" rel="nofollow">https://en.wikipedia.org/wiki/Fallacies_of_Distributed_Computing</a></li> </ul> <p>There are many forms of concurrent web-based <a href="https://en.wikipedia.org/wiki/List_of_collaborative_software" rel="nofollow">collaborative software</a>.</p> <p>There are a number of <a href="https://github.com/ether/etherpad-lite/wiki/HTTP-API-client-libraries" rel="nofollow">HTTP API client libraries for etherpad-lite</a>, a <a href="https://en.wikipedia.org/wiki/Collaborative_real-time_editor" rel="nofollow">collaborative real-time editor</a>.</p> <p><a href="https://github.com/FZambia/django-realtime-playground" rel="nofollow">django-realtime-playground</a> implements a realtime chat app in Django with various real-time technologies like <a href="https://en.wikipedia.org/wiki/Socket.IO" rel="nofollow">Socket.io</a>.</p> <p>Both AppEngine and AppScale implement the <a href="https://developers.google.com/appengine/docs/python/channel/" rel="nofollow">AppEngine Channel API</a>; which is distinct from the <a href="https://developers.google.com/drive/v2/reference/" rel="nofollow">Google Realtime API</a>, which is demonstrated by <a href="https://github.com/googledrive/realtime-playground" rel="nofollow">googledrive/realtime-playground</a>.</p>
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    1. POHow to design a multi-user ajax web application to be concurrently safe
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