Putty registry options

Hi Friends,

Could anyone please give me the purpose of following PuTTy registrykeys or point me the link where documentation is given about theseoptions. On this site, I didn't find any details related with thesekeys.

    AuthKI
    AuthSSPI
    AuthTIS
    Answerback
    ChangeUsername
    GSSAPIServerChoosesUserName
    LoginShell
    ProxyDNS
    SSHLogOmitData
    SSHLogOmitPasswords
    SshNoAuth
    Sshprot
    X11AuthType
    X11Forward

Thanks,
Megha