The ID of the dialog item receiving the event (usually it is the item that has the keyboard focus).
TRUE - the key was processed internally.
FALSE - the key should be processed by the internal handler of the Dialog API kernel.
Example of processing the event:
// Center the dialog if the user has pressed Ctrl-Apps
case DN_KEY:
if(Param2 == KEY_CTRLAPPS)
{
COORD c={-1,-1};
Info.SendDlgMessage(hDlg,DM_MOVEDIALOG,TRUE,(LONG_PTR)&c);
return TRUE;
}