private static extern NtStatus LsaEnumerateLogonSessions(out uint LogonSessionCount, out IntPtr LogonSessionList);

Declare Function LsaEnumerateLogonSessions Lib "secur32.dll" (TODO) As TODO

private static extern uint LsaEnumerateLogonSessions(out UInt64 LogonSessionCount, out IntPtr LogonSessionList);

  LsaEnumerateLogonSessions(out count, out luidPtr);  //gets an array of pointers to LUIDs