Have a look into the reactos sources. Its a quite good documentation for such low level functions. ... but I dont think programms using such low level functions are working at the moment. The ntdll implementation of wine is not quite advanced. juergen > I have an application which seems to want these two Rtlp functions from > ntdll, but they are not defined in the Win32 SDK HLP file and are define as > BUILTIN32_Unimplemented in ntdll.spec.. If someone has the interface > definitions and possibly a description of what they do I would like to try > to implement them. > > Thank you in advance > > David > > > >