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See that box in the top-left corner of the dialog?
It's a tree containing some functions.
MMFInterface
|_Runtime
...|_PauseRuntime()

Runtime.PauseRuntime() is saved in a namespace called...

Oh, sorry, still not correct.
Put it into a class and add "public" before "void"

using MMFInterface;
public class class1 {
void TestFunction ()
{
Runtime.PauseRuntime();
}
}