// theApp - is a CWinApp instance

POSITION curTemplatePos = theApp.GetFirstDocTemplatePosition();

	while(curTemplatePos != NULL)
	{
		CDocTemplate* curTemplate =
			theApp.GetNextDocTemplate(curTemplatePos);
		CString str;
		curTemplate->GetDocString(str, CDocTemplate::docName);
// Here you determine which template you want to access ( kind of doc)
// "SomeName" is passed to program in CWinApp::InitInstance(..) when you 
// register doc templates by declaring CMultiDocTemplate classes

		if(str == _T("SomeName"))
		{
			
			POSITION pos = curTemplate->GetFirstDocPosition();
			while (pos != NULL)
			{
				CDocument* pDoc = curTemplate->GetNextDoc(pos);
// Do with pDoc what ever you wish
			}
			return;    
		}
	}
AfxMessageBox("Wrong template name");

BOOL CSomeProjectApp::InitInstance()
{
	// Register the application's document templates.  Document templates
	// serve as the connection between documents, frame windows and views.

	CMultiDocTemplate* pSomeNameTemplate;
	pSomeNameTemplate = new CMultiDocTemplate(
		IDR_SOMENAMETYPE,
		RUNTIME_CLASS(CSomeNameDoc),
		RUNTIME_CLASS(CSomeNameFrame), // custom MDI child frame
		RUNTIME_CLASS(CSomeNameView));
	AddDocTemplate(pSomeNameTemplate);

// Add AnotherName template to list

	CMultiDocTemplate* pAnotherNameTemplate;
	pAnotherNameTemplate = new CMultiDocTemplate(
		IDR_ANOTHERNAMETYPE,
		RUNTIME_CLASS(CAnotherNameDoc),
		RUNTIME_CLASS(CAnotherNameFrame), // custom MDI child frame
		RUNTIME_CLASS(CAnotherNameView));
	AddDocTemplate(pAnotherNameTemplate);

	// create main MDI Frame window
	CMainFrame* pMainFrame = new CMainFrame;
	if (!pMainFrame->LoadFrame(IDR_MAINFRAME))
		return FALSE;
	m_pMainWnd = pMainFrame;

	// The main window has been initialized, so show and update it.
	pMainFrame->ShowWindow(m_nCmdShow);
	pMainFrame->UpdateWindow();

	return TRUE;
}