Hi Yoshiki,

>   I have an impression that OpenType utilize the "compound glyph"
> mechanism, which the TT renderer in Squeak can handle, to do the
> "ligatures" in Thai, Devanagari, etc.  I need to look into the
> detail...

Now that you're saying this I (vaguely) remember having seen something that
discusses this for TrueType too. Wait ... let me check ... google is your
friend ... nope it's all in TrueType Open (aka OpenType). But it's in there
for the latin fonts too!

Cheers,
  - Andreas