/// <param name="wtsInfoClass">Specifies the type of information to retrieve. This parameter can be one of the values from the <see cref="WTSInfoClass"/> enumeration type. </param>

/// <param name="ppBuffer">Pointer to a variable that receives a pointer to the requested information. The format and contents of the data depend on the information class specified in the <see cref="WTSInfoClass"/> parameter.

    System.IntPtr hServer, int sessionId, WTSInfoClass wtsInfoClass, out System.IntPtr ppBuffer, out uint pBytesReturned);

WTSInfoClass

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

    /// <param name="wtsInfoClass">Specifies the type of information to retrieve. This parameter can be one of the values from the <see cref="WTSInfoClass"/> enumeration type. </param>

    /// <param name="ppBuffer">Pointer to a variable that receives a pointer to the requested information. The format and contents of the data depend on the information class specified in the <see cref="WTSInfoClass"/> parameter.

                System.IntPtr hServer, int sessionId, WTSInfoClass wtsInfoClass, out System.IntPtr ppBuffer, out uint pBytesReturned);

                    bool sessionInfo = WTSQuerySessionInformation( System.IntPtr.Zero, WTS_CURRENT_SESSION, WTSInfoClass.WTSSessionId, out buffer, out bytesReturned );

public enum WtsInfoClass