What is a "half-size british number"?

Question

As in these links:

http://www.google.ru/search?complete=1&hl=ru&newwindow=1&q=%22half-size+british+number%22&lr=&aq=f

Answer 1

"Half size British number" refers to the english input method in Janpanese keyboard, which means single byte input for alphanumeric characters; for Chinese/Japanese/other double byte characters entry , people will need to switch keyboard to "full size" intead.