The CreateMapping method of the IIsCertMapper object creates a mapping between a certificate and a Windows NTŪ account.
IIsCertMapper.CreateMapping vCert, NtAcct, NtPwd, strName, IEnabled 
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Dim CertObj, vCert 
vCert = Request.ClientCertificate("CERTIFICATE") 
Set CertObj = GetObject("IIS://..path../IIsCertMapper") 
CertObj.CreateMapping vCert, "MYACCT", "MYPASS", "My Name", True 
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 GetMapping, DeleteMapping, SetEnabled, SetName, SetPwd, SetAcct