If someone want to get a COM object out of a DCOM object can do something like that:
<?php
$dcom_obj = new COM('dacom.object','remotehost') or die("Unable to get DCOM object!");
$com_obj = new Variant(NULL);
$dcom_obj->Get_Module($com_obj); //user function which returns a custom IDispatch (casted as variant*)
?>
Hopefully this will help someone, because it took me quite long to figure this out.