Query whether file exists in different application
<p>I have I have two applications. I have a menu button on one application (service A) that is used to trigger an action in a different service (service B).</p>

<p>I want to make the menu item (service A) visible only if a file is present in service B.</p>

<p>Is there a clean mechanism for achieving this, rather than using absolute paths with File?</p>
