to retrive all user list using wts

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C++

hi everyone. I have written a code to enumerate all user list but

problem 1:
it is displaying names of active users only on local system. but when i take remote of other system and run my code it retrieves nothing.whereas i want the list of all users including active users,disconnected users,console users

problem 2:
i also want to display the states of user (like active,disconnected,console).

how do i acheive this can any one help?

#include "stdafx.h"



#ifndef _WIN32_WINNT		      // Allow use of features specific to Windows X or later.                   
#define _WIN32_WINNT 0x0501	// Change this to the appropriate value to target other versions of Windows.
#endif	

#include <windows.h>
#include <WtsApi32.h>
#include <tchar.h>


#pragma comment(lib, "WtsApi32.lib")




int _tmain(int argc, TCHAR** argv)
{
	LPTSTR szUserName = NULL;
	LPTSTR szDomainName = NULL;
	DWORD dwLen = 0;
	BOOL bStatus = WTSQuerySessionInformation(WTS_CURRENT_SERVER_HANDLE,
		WTS_CURRENT_SESSION,
		WTSDomainName,
		&szDomainName,
		&dwLen);
	if (bStatus)
	{
		bStatus = WTSQuerySessionInformation(WTS_CURRENT_SERVER_HANDLE,
			WTS_CURRENT_SESSION,
			WTSUserName,
			&szUserName,
			&dwLen);
		if (bStatus)
		{
			DWORD cbUpn = _tcslen(szUserName) + 1 + _tcslen(szDomainName);
			LPTSTR szUpn = (LPTSTR)LocalAlloc(0, (cbUpn + 1) * sizeof(TCHAR));

		/*	_tcscpy(szUpn, szUserName);
			_tcscat(szUpn, _T("@"));
			_tcscat(szUpn, szDomainName);
*/
			_tprintf(_T("UPN = %s\n"), szUserName);

			LocalFree(szUpn);
			WTSFreeMemory(szUserName);
		}
		else
		{
			_tprintf(_T("WTSQuerySessionInformation on WTSUserName failed with error 0x%.8X\n"), GetLastError());
		}
		WTSFreeMemory(szDomainName);
	}
	else
	{
		_tprintf(_T("WTSQuerySessionInformation on WTSDomainName failed with error 0x%.8X\n"), GetLastError());
	}
	return 0;
}