CompuServe Messages

Here is something I have been wondering about: I have Lattice C 5.0 (upgraded to 5.04). Where can I find documentation on added commands etc. An example is vsprintf(). It is not in the manuals anywhere and I cannot seem to find it in the readme files. Also, I cannot compile any assembly files with the Lattice assembler unless i put a "section code,text" or something as the first line.