Suspension of any external processes using functions OpenThread(), SuspendThread() a ResumeThread().

#include <Windows.h>
#include <TlHelp32.h>

HWND GetProcessMainWindows( DWORD dwProcessID );
DWORD GetProcessID( TCHAR *lpszProcessName );

DWORD WINAPI Vlakno(void*);

int _tmain(int argc, _TCHAR* argv[])
{
	HWND windowHandle = FindWindow(NULL, _T("Test"));
	printf("HWND: %d\n", GetWindowThreadProcessId(windowHandle, NULL) );
	DWORD hThread = GetWindowThreadProcessId(windowHandle, NULL);
	printf( "%d\n", hThread );

	//HANDLE handle = CreateThread( NULL, NULL, &Vlakno, (void*)11 , 0, 0 );
	HANDLE thread = OpenThread(THREAD_ALL_ACCESS, FALSE, hThread);
	printf( "%d\n", thread );

	//printf( "Resume: %d\n", ResumeThread( thread ) );

	while(true) 
	{
	  printf( "Suspend: %d\n", SuspendThread( thread ) );
	  Sleep(1000); // some number of milliseconds - larger values will slow down more
	  //printf( "Resume: %d\n", ResumeThread( thread ) )
	  while ( ResumeThread( thread ) > 0);

	  Sleep(100);
	}
	while ( ResumeThread( thread ) > 0);
	return 0;
}

DWORD WINAPI Vlakno(void*)
{
	for(u_int i=0; true; i++ )
		printf("[%d] Hello\n", i);

	return true;
}

HWND GetProcessMainWindows( DWORD dwProcessID )
{
	HWND hwnd = NULL;

	do{
		hwnd = FindWindowEx (NULL, hwnd, NULL, NULL);
		DWORD dwPID = 0;
		GetWindowThreadProcessId (hwnd, &dwPID);
		if (dwPID == dwProcessID)
			return hwnd;
	}while( hwnd != NULL );
	return NULL;
}

DWORD GetProcessID( TCHAR *lpszProcessName )
{
	DWORD processID = NULL;

	HANDLE hSnapShot = CreateToolhelp32Snapshot ( TH32CS_SNAPPROCESS, 0);
	PROCESSENTRY32* processInfo = new PROCESSENTRY32;
	processInfo->dwSize = sizeof ( PROCESSENTRY32);
	while ( Process32Next ( hSnapShot,processInfo ) != FALSE)
	{
		if( strcmp( processInfo->szExeFile, lpszProcessName ) == 0 )
		{
			processID = processInfo->th32ProcessID;
			break;
		}
	}

	CloseHandle( hSnapShot);
	delete processInfo;

	return processID;
}