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Although in the case of Hong Kong, neither Pinyin input nor Zhuyin input are likely to be used, as both are based on the phonetics of standard Mandarin Chinese. There are alternative input methods that are shape-based (https://en.wikipedia.org/wiki/Chinese_input_methods_for_comp...) such as the Cangjie, and Cantonese-only input methods.

[andyjdavis]

I actually have not come across Cangjie before and it looks really interesting. Thank you for the link :)