Server-side scripts?

[Jeff Bailey]

What types of server-side scripts are considered okay?

For example, can I use <!--#include "..."--> statements?  Is php3 enabled 
by default?

I haven't been able to find a defininetive reference for this.

-- 
I write portable software for a living, and my code has to compile
with gcc as well as with a variety of other compilers. [...]  If
the price of that is to have Linus Torvalds insult me once in a while,
so be it.
 - Joe Buck http://gcc.gnu.org/ml/gcc/2001-01/msg00075.html