build questions

[Kostis Sagonas]

I can only comment on this one:

 > 2. Can someone tell me about shared and hybrid emulators?

The shared (heap) emulator is no longer supported and will be
taken out from the system -- if not already.  The hybrid heap
emulator will remain.  As far as the build system is concerned,
its difference with the private heap one which is the default, 
is the -DHYBRID passed to the C compiler.  A different beam
executable is made and is called when the -hybrid flag is
passed to the "erl" script.

Kostis