ByVal InfoClass As WTS_INFO_CLASS, _

    private static extern bool WTSQuerySessionInformation(IntPtr hServer, int sessionId, WTS_INFO_CLASS wtsInfoClass, out IntPtr ppBuffer, out int pBytesReturned);

        if (WTSQuerySessionInformation(IntPtr.Zero, sessionId, WTS_INFO_CLASS.WTSUserName, out buffer, out strLen) && strLen > 1)

        if (WTSQuerySessionInformation(IntPtr.Zero, sessionId, WTS_INFO_CLASS.WTSDomainName, out buffer, out strLen) && strLen > 1)

enum WTS_INFO_CLASS

Public Enum WTS_INFO_CLASS

    Private Enum WTS_INFO_CLASS

enum WTS_INFO_CLASS

    Private Enum WTS_INFO_CLASS