Hooks

Hello!
I am using a keyboard-hook with code in a DLL like this:

#define STRICT
#include <windows.h>

#pragma comment(linker, "/SECTION:.shared,RWS")
#pragma data_seg(".shared")
    HHOOK hHook = NULL;
#pragma data_seg()

HANDLE      hInstance;

BOOL WINAPI DllMain (HINSTANCE hInst, DWORD dwReason, PVOID pvReserved)
{
    if (dwReason == DLL_PROCESS_ATTACH)
        hInstance = hInst;
    return TRUE;
}

LRESULT CALLBACK KeyboardProc(int iCode, WPARAM wParam, LPARAM lParam)
{
    if (iCode >= 0 )
    {
        if ((iCode == HC_ACTION) && (! (lParam & 0x80000000) ))
             MessageBox(NULL, "MsgBox", "A key was pressed", MB_ICONINFORMATION);
    }
    return CallNextHookEx(hHook,iCode,wParam,lParam);
}

__declspec (dllexport) BOOL KeylogOff()
{      
     if (hHook)
          if (UnhookWindowsHookEx(hHook))
               hHook = NULL;
     return (!hHook);
}

__declspec (dllexport) BOOL KeylogOn()
{
     if (hHook)
         KeylogOff();
     hHook = SetWindowsHookEx(WH_KEYBOARD, (HOOKPROC) KeyboardProc, (HINSTANCE) hInstance, 0);
     if (!hHook)
     {
         MessageBox(NULL,"Cannot set Keyboard hook","Error",MB_OK);
         return 0;
     }
     return 1;
}


This code works, but if I run another program, that uses a keyboard-hook (even another instance of my program, runned from other directory), he's in front of the hook chain, and I'm not getting messages. Is there a function, that informs me, what is my current position in hook chain? Is my KeyboardProc function passing messages to next hook right?
Another problem is in MS-DOS. If I run MS-DOS prompt in Windows, my program doesn't get keyboard messages from that window. I've tried WH_GETMESSAGE filter, but I don't know, what message I have to capture.

Thanks in advance.