Mikail

Here are some functions and their corresponding error messages.
If you open up "Homeworld2.exe" in a text-editor, you'll find all the functions listed about mid-way through, along with their error messages. You could use this information to determine what arguments the remaining functions take. Note, that some arguments return the same error message.
If you call a function with an incorrect number of arguments, an error message will be returned informing you of this. Just keep calling the function with a different number of arguments (starting at 0), until this error message is not returned.
As far as I know, only some global LUA functions (and the addPath function) can be called with an arbitrary number of arguments. Therefore, you generally don't have to worry about functions that can be called with, for instance, either two or three arguments. I think the error messages are listed in the correct order.
[edit]The list has been updated and moved to this page:
http://hw2.tproc.org/wiki/ErrorMessages