Long ago, at this forum, there are a few intelligent programmer, such as Stephane, Mikael, Petric to ask many insightful questions. And there are some genious guru from Matra, such as Sergey RUIN, to answer this question.
In fact, from their post I learn quite a few.
But now, there is almost no one to answer our questions. ( some time Stephane and Pettric will, but they disappear quite a few time. :-) ).
MISSING THE OLD GOOD DAYS!