In the case of NS4 and Thai (and most other non-european languages), I've been told the only way is to use the 'x-user-define' charset associated with a Thai font face. Maybe Korakot can confirm?

Correct charset for Thai used to be a big trouble. Now most agree to the gov. standard of 'tis-620' and luckily that most Thais use IE, and even for NN4 'tis-620' will be equivalent to specifying nothing.

Korakot

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