# OPC Tag Event Change

**URL:** <https://forum.inductiveautomation.com/t/opc-tag-event-change/18111>\
**Category:** Ignition\
**Created:** [May 21, 2018, 11:15pm UTC](https://forum.inductiveautomation.com/t/opc-tag-event-change/18111 "2018-05-21T23:15:19Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![nruimveld](https://avatars.discourse-cdn.com/v4/letter/n/8797f3/32.png) [@nruimveld](https://forum.inductiveautomation.com/u/nruimveld)\
**Post date:** [May 21, 2018, 11:15pm UTC](https://forum.inductiveautomation.com/t/opc-tag-event-change/18111/1 "2018-05-21T23:15:19Z")

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I would like to open a popup window on an OPC tag event change in the Gateway Event Scripts - Tag Change window.

Any help would be greatly appreciated, thank you!

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [May 21, 2018, 11:21pm UTC](https://forum.inductiveautomation.com/t/opc-tag-event-change/18111/2 "2018-05-21T23:21:21Z")

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You can’t; tags, gateway event scripts, and tag change scripts all exist in the gateway scope. There’s no client to open a window on.

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<div class="post-metadata">

**Author:** ![nruimveld](https://avatars.discourse-cdn.com/v4/letter/n/8797f3/32.png) [@nruimveld](https://forum.inductiveautomation.com/u/nruimveld)\
**Post date:** [May 21, 2018, 11:39pm UTC](https://forum.inductiveautomation.com/t/opc-tag-event-change/18111/3 "2018-05-21T23:39:53Z")

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Yeah, I figured it out, thank you though!

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**Author:** ![mike4](https://avatars.discourse-cdn.com/v4/letter/m/aeb1de/32.png) [@mike4](https://forum.inductiveautomation.com/u/mike4)\
**Post date:** [October 12, 2022, 3:13pm UTC](https://forum.inductiveautomation.com/t/opc-tag-event-change/18111/4 "2022-10-12T15:13:00Z")

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What did you to to implement this? I am trying to do the same thing. Open a popup once a tag is changed.

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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:** [October 12, 2022, 3:22pm UTC](https://forum.inductiveautomation.com/t/opc-tag-event-change/18111/5 "2022-10-12T15:22:00Z")

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This is a topic from 2018, so presumably you are interested in Vision. (Perspective didn't exist yet then.) Nowadays, you should tag a _ **new topic** _ accordingly.

In Vision, you can make a client tag change event script in the appropriate project. That script can open a popup window.

In Perspective, there are a couple approaches, depending on how widely you want the popup to interrupt. The simplest and most local would be to bind the tag to a view custom parameter and have a change event open the popup.