Hi, On Thu, 12 Oct 2006, Kai Tietz wrote: > thanks for description. I wasn't aware, that the upper 32 bits are > zeroed. Does this means that even the stack has to be in the first 4 Gb, > too. Why should it? I.e. no, it doesn't have to. > Or does this mov instruction does a sign-extention. Which mov instruction? Ciao, Michael.