# Binding to a \[System\] tag

**URL:** <https://forum.inductiveautomation.com/t/binding-to-a-system-tag/75240>\
**Category:** Ignition\
**Tags:** ignition81, perspective\
**Created:** [June 19, 2023, 9:16pm UTC](https://forum.inductiveautomation.com/t/binding-to-a-system-tag/75240 "2023-06-19T21:16:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![wpmccormick](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/wpmccormick/32/13940_2.png) [@wpmccormick](https://forum.inductiveautomation.com/u/wpmccormick)\
**Post date:** [June 19, 2023, 9:16pm UTC](https://forum.inductiveautomation.com/t/binding-to-a-system-tag/75240/1 "2023-06-19T21:16:29Z")

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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.

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [June 19, 2023, 9:36pm UTC](https://forum.inductiveautomation.com/t/binding-to-a-system-tag/75240/2 "2023-06-19T21:36:32Z")

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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.

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**Author:** ![cmallonee](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/cmallonee/32/6416_2.png) [@cmallonee](https://forum.inductiveautomation.com/u/cmallonee)\
**Post date:** [June 19, 2023, 9:37pm UTC](https://forum.inductiveautomation.com/t/binding-to-a-system-tag/75240/3 "2023-06-19T21:37:30Z")

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Perspective does not make use of the `System` tags - those are for Vision Clients. You should look into accessing a [session prop](https://docs.inductiveautomation.com/display/DOC81/Session+Properties#:~:text=Properties%20for%20the%20device%20that%20is%20running%20the%20Session.%C2%A0) 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".