mIRC

Although it is a fully functional chat utility, its integrated scripting language makes it extensible and versatile.

mIRC has been downloaded over twenty-three million times from CNET's www.download.com service. Nielsen//NetRatings also ranked mIRC among the top ten most popular Internet applications in 2003.

It is unknown if the "m" in mIRC stands for anything (the author's personal FAQ explains that "it quite possibly stands for 'moo', or perhaps even MU"). The author pronounces it "m-I-R-C", or "mirk" for short.
mIRC has a number of features that set it apart from other IRC clients. One of the more obvious differences is its own advanced scripting language (see below) which is further developed with each version. The scripting language can be used to make minor changes to the program like custom commands (aliases), but can also be used to completely alter the behavior and appearance of mIRC. Another widely used feature is mIRC's file sharing abilities, via the DCC protocol. It also has a built in file server.

Over the years various other features that have often been suggested by users have been incorporated. This includes support for multiple server connections, SSL, UTF-8 display support and an option to view channels and notify lists in a treebar format rather than the default switchbar. mIRC is still in active development but it is very rarely announced what features will be introduced in the future.

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mIRC 6.35