If you are good at reverse engineering, you can try to find a call to that function. Than look at the sthings that are pushed onto the stack. That should give you an idea about how many variables are used by the api. There is one catch though, you don't know what the variables types are, nor do you know what they are used for. I don't know why you need to do that, but if you're planning to use undocumented api's, I can only say that you should not! They are not documented for a reason. The could be subject to change, or complete removal, so in the long run, it will break your program. I also got the blogging virus..[^]
