Kanji Backspace
This function backspaces within text stored using the encoding scheme known as double-byte character sets (DBCS). Although other writing systems are encoded using DBCS, this problem has acquired the name Kanji Backspace.
A text string encoded in DBCS contains a mixture of single-byte and double-byte characters. Single-byte characters are the ASCII characters that many programmers are familiar with; a capital 'A' is represented by the single byte 65. Double-byte characters occupy 2 bytes in the encoding.
To tell them apart, single characters in DBCS are allowed to use only 7 bits, with the high bit off. In a double-byte character, ...
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