i have 2 applications communicating between each other.
one will send a password/username/etc. to the other.

and i want that only specific application may request these data from the second application.

i send the request with:

  h:=FindWindow('TLoader',nil)
  if h <> 0 then SendMessage(h,WM_ACCESSREQUEST,0,1);

how can the receiver identify the sender application?
the msg argument doesn't have such a property.

  procedure OnAccessRequest(var msg: TMessage); message WM_ACCESSREQUEST;

: i have 2 applications communicating between each other.
: one will send a password/username/etc. to the other.
:
: and i want that only specific application may request these data from the second application.
:
: i send the request with:
:

:   h:=FindWindow('TLoader',nil)
:   if h <> 0 then SendMessage(h,WM_ACCESSREQUEST,0,1);
: 

:
:
:
: how can the receiver identify the sender application?
: the msg argument doesn't have such a property.
:
:

:   procedure OnAccessRequest(var msg: TMessage); message WM_ACCESSREQUEST;
: 

:
:
:
:
:
:
:
You could use the lParam or wParam for that.