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There are special scan codes for those buttons, perhaps look into keyboard hook.

thank you very much for your answer!
i just had no time for implementing that stuff, but i've done it now.
however, i've discovered a problem already; i use the following code:

WM_APPCOMMAND				equ 319h

APPCOMMAND_MEDIA_NEXTTRACK  equ 11

APPCOMMAND_MEDIA_PREVIOUSTRACK equ 12

APPCOMMAND_MEDIA_STOP  equ 13

APPCOMMAND_MEDIA_PLAY_PAUSE equ 14



  .elseif eax==WM_APPCOMMAND

	  mov eax,lParam

	  shr eax,16

	  and ax,7fffh

	  

	  .if ax==APPCOMMAND_MEDIA_NEXTTRACK

		  mov eax,IDC_NEXT

  		invoke SendMessage,hWin,WM_COMMAND,eax,0

	  .elseif ax==APPCOMMAND_MEDIA_PREVIOUSTRACK

	  	mov eax,IDC_PREV

	  	invoke SendMessage,hWin,WM_COMMAND,eax,0

	  .elseif ax==APPCOMMAND_MEDIA_STOP

	  	mov eax,IDC_STOP

	  	invoke SendMessage,hWin,WM_COMMAND,eax,0

	  .elseif ax==APPCOMMAND_MEDIA_PLAY_PAUSE

	  	mov eax,IDC_PLAYPAUSE

	  	invoke SendMessage,hWin,WM_COMMAND,eax,0

	  .else

		  xor eax,eax

		  ret

	  .endif

this works perfectly, as it should; but only when the window has the focus! i've checked windows media player. that one works without focus as well. I have to add, that i use a windows without a window-frame and without a taskbar-button-thingy. furthermore i've tested it with a normal window, which also didn't work without focus.
so, do you have any idea how i could get the message without focus as well?

thanks for your quick reply; unfortunately this doesn't seem to work. please take a look at my code (currently in c since the assembler doesn't work on that xp-machine). actually i think that it works your way, but not with my code i've created:

;the hook-proc

HHOOK hMessage=0;



LRESULT CALLBACK GetMsgProc(int code,WPARAM wParam,LPARAM lParam)

{ MSG *message=(MSG*)lParam;

  CallNextHookEx(hMessage,code,wParam,lParam);



  if(message->message==WM_APPCOMMAND)

  { MessageBox(NULL,"hook","test",MB_OK);

	}

	return 0;

}



;the window-proc

switch( message ) 

{ case WM_CREATE:

    MessageBox(hWnd,"hook installed","out",MB_OK);

    hMessage=SetWindowsHookEx(WH_GETMESSAGE,&GetMsgProc,hInst,NULL);

    break;

  :

}

the SetWindowsHookEx-function returns non-zero and i get the messagebox. but i don't get any message via the hook when i press a button. i.e. the hook doesn't work at all. and idea why?

nah! expressed me wrong i think; i meant the messagebox saying "hook installed", but not the one with "hook".. obviously it's not working then