A1 - Yes, there is no problem in storing or retreving Japanese (dubbel-byte) data in a Sql server. You just have to find the setup options for the server(Apache, IIS, etc) you use, the language (PHP, ASP,etc), and the database server (MySQL, ...).
A2 - It should not be any problem to mix the both languages as English characters are included at the beginning of the Japanese/Korean/Chinese codes.
Q3 I leave for someone who knows.
:rolleyes: