Sequence of authentification

Hi,
I programe an application that need to be authenticate to a FileServer. This
programme run on a win32 platform, i want tu use the eDirecory Lib for C to
connect this the station to the network.

I'm trying some sequence that work, but no one can login on an other user. I
catch then a need to logout and Close connection to login on an other user,
but when i try to close the connection with the fonction NWCCCloseConn, the
connection persist.

If any body can send to me a a function that include the gestion of logout
when the station ar already authenticate to the server, thank