SpAcceptCredentialsFn

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
extern (Windows) nothrow
alias SpAcceptCredentialsFn = NTSTATUS function(SECURITY_LOGON_TYPE, PUNICODE_STRING, PSECPKG_PRIMARY_CRED, PSECPKG_SUPPLEMENTAL_CRED)

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