C API parts I can skip ?

[Patrick <patrick@...>]

So the C API is very simple but that does not mean it is simple enough 
for me ;)

Are these functions mostly used internally and in advanced cases:
lua_Alloc
lua_getallocf
lua_setallocf
lua_Writter

How about this one, is it rare? :
lua_xmove ( I will not be using multi-threaded C/C++)

Are the lua_rawXXX family of functions more for advanced use as well?

Thanks for reading-Patrick