Binding to a [System] tag

I'm trying to bind a custom property to a system tag to determine if the client is mobile.

The binding result for the SystemFlags tag itself is Bad_NotFound, but in the designer tag browser I can see it's a 1 as expected.

Also, I found system.util.MOBILE_FLAG constant (from another topic), but I'll be damned if I can find where that's documented.

The former is Vision only.

The latter is a leftover from the v7.9 mobile module, I think.

In Perspective you would look at the session properties for the device type.

Perspective does not make use of the System tags - those are for Vision Clients. You should look into accessing a session prop for the Session: props.device is likely what you're looking for.

Keep in mind that mobile devices using a browser instead of the native application will report as "browser".