C / C++ / MFC

LRESULT CALLBACK WindowProc(
  HWND hwnd,       // handle to window
  UINT uMsg,       // WM_SIZE
  WPARAM wParam,   // resizing flag
  LPARAM lParam    // client area
);

#include <windows.h>
#include <stdio.h>

int main()
{
    HANDLE hTimer = NULL;
    LARGE_INTEGER liDueTime;

    liDueTime.QuadPart=-100000000;

    // Create a waitable timer.
    hTimer = CreateWaitableTimer(NULL, TRUE, "WaitableTimer");
    if (!hTimer)
    {
        printf("CreateWaitableTimer failed (%d)\n", GetLastError());
        return 1;
    }

    printf("Waiting for 10 seconds...\n");

    // Set a timer to wait for 10 seconds.
    if (!SetWaitableTimer(
        hTimer, &liDueTime, 0, NULL, NULL, 0))
    {
        printf("SetWaitableTimer failed (%d)\n", GetLastError());
        return 2;
    }

    // Wait for the timer.

    if (WaitForSingleObject(hTimer, INFINITE) != WAIT_OBJECT_0)
        printf("WaitForSingleObject failed (%d)\n", GetLastError());
    else printf("Timer was signaled.\n");

    return 0;
}

void CMyApp::UpdateEverybody()
{
    POSITION posTemplate;
    POSITION posDocument;
 
    //Look through the list of templates.
    posTemplate = GetFirstDocTemplatePosition();
    while(posTemplate)
    {
        CDocTemplate* pTemplate = GetNextDocTemplate(posTemplate);
        if(pTemplate)
        {
            //Look through the list of docs.
            posDocument = pTemplate->GetFirstDocPosition();
            while(posDocument)
            {
                CDocument *pDoc = theApp.pDefectDocTemplate->GetNextDoc(posDocument);
                if(pDoc)
                    pDoc->UpdateAllViews(NULL);
            }
        }
    }
}

//In your code.
...
    //Update everybody.
    theApp.UpdateEverybody();
...

class CMyApp : public CWinApp
{
    ...
};
 
//Add this.
extern CMyApp theApp;

void CMyApp::SendMessageToEverybody(UINT nMsg, WPARM wParam, LPARM lParam)
{
  //See MSDN for help with SendMessageToDescendants.
  //AfxGetMainWnd()->SendMessageToDescendants(nMsg, wParam, lParam, ...);
}