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As i came across this code,


so wanted to know why and when to use this kind of key.

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up vote 2 down vote accepted

This is a Japanese modifier key which will change between Hankaku (half-width) and Zenkaku (full-width) characters. To try and visualise this:

Hankaku - 12345

Zenkaku - 1 2 3 4 5

As to which key it is bound to on the keyboard, F9 and F10 are common bindings. F10 will change from Zenkaku to Hankaku, and F9 from Hankaku to Zenkaku.

Source - Wikipedia

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