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Send message to specific client with socket.io and node.js

I'm working with socket.io and node.js and until now it seems pretty good, but I don't know how to send a message from the server to an specific client, something like this: ...
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Android emulator freezing OS X v10.9 (Mavericks) with HAXM

I just updated to OS X v10.9 (Mavericks), and now whenever I start up any of my emulators, as soon as the emulator starts up, my entire computer freezes with a spinning progress indicator in the center of the screen (not a beachball, the progress indicator is similar to what you see when shutting...
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Curious null-coalescing operator custom implicit conversion behaviour

...ils here. We have a nullable optimizer that looks for situations where we know that a particular expression of nullable type cannot possibly be null. Consider the following naive analysis: we might first say that result = Foo() ?? y; is the same as A? temp = Foo(); result = temp.HasValue ? ...
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Convert Existing Eclipse Project to Maven Project

...nsidering using the Maven plugin for Eclipse to automate our builds. Right now the procedure is far more complicated than it ought to be, and we're hoping that Maven will simplify things to a one-click build. ...
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MySQL COUNT DISTINCT

... countVisits , site_id As site From cp_visits Where ts >= DATE_SUB(NOW(), INTERVAL 1 DAY) Group By site_id share | improve this answer | follow | ...
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How to get index in Handlebars each helper?

...4811 The index of the current array item has been available for some time now via @index: {{#each array}} {{@index}}: {{this}} {{/each}} For object iteration, use @key instead: {{#each object}} {{@key}}: {{this}} {{/each}} ...
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Autoresizing masks programmatically vs Interface Builder / xib / nib

... Is everything clear now? Also, I really meant it when I said I appreciated your post. I actually favorited it b/c this has confused me in the past. I think it's a great Q. – Sam Oct 19 '11 at 19:31 ...
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WatiN or Selenium? [closed]

...ution. Script creation tools are independent projects; there are 2 that I know of: Wax (Excel based, hosted on CodePlex) and WatiN Test Record (hosted on SourceForge). Neither is as robust as Selenium IDE. Very good IE support. Can attach and detach to/from running instances. Can access native wind...
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How well is Unicode supported in C++11?

...le to focus on an encoding that was superseded over 20 years ago, I don't know‡. It's not like support for more encodings is bad or anything, but UCS-2 shows up too often here. I would say that char16_t is obviously meant for storing UTF-16 code units. However, this is one part of the s...
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Choosing a stand-alone full-text search server: Sphinx or SOLR? [closed]

... I've been using Solr successfully for almost 2 years now, and have never used Sphinx, so I'm obviously biased. However, I'll try to keep it objective by quoting the docs or other people. I'll also take patches to my answer :-) Similarities: Both Solr and Sphinx satisfy all ...