# Perspective: sendMessage to all open clients?

**URL:** <https://forum.inductiveautomation.com/t/perspective-sendmessage-to-all-open-clients/38003>\
**Category:** Ignition\
**Tags:** ignition80, perspective\
**Created:** [August 23, 2020, 9:42am UTC](https://forum.inductiveautomation.com/t/perspective-sendmessage-to-all-open-clients/38003 "2020-08-23T09:42:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [August 23, 2020, 9:42am UTC](https://forum.inductiveautomation.com/t/perspective-sendmessage-to-all-open-clients/38003/1 "2020-08-23T09:42:57Z")

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v8.0.15

Can I call `system.perspective.sendMessage` within a tag change script to send a message to all client message handlers?

I have a View that shows a list (View Canvas) of active tags; inactive tags are not shown. I want the canvas instances to update if the tags change values i.e. remove active tags that become inactive, and add any tags that become active. Using a change event script on the Views I embed in the View Canvas, I can remove those that are displayed that become inactive, but I can’t add those that become active that aren’t displayed.

Note:  
‘Active’ = 1  
‘Inactive’ = 0

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<div class="post-metadata">

**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:** [August 23, 2020, 2:31pm UTC](https://forum.inductiveautomation.com/t/perspective-sendmessage-to-all-open-clients/38003/2 "2020-08-23T14:31:25Z")

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Indirectly, yes. Use [system.util.sendMessage()](https://docs.inductiveautomation.com/display/DOC80/system.util.sendMessage) with the session (“S”) scope to send the trigger/message to your Sessions. You will need to configure a Session-level Message Handler (in the Designer menu bar, Project \> Session Events \> Message) to listen for the incoming message. Within THAT handler, you will then need to use [system.perspective.sendMessage()](https://docs.inductiveautomation.com/display/DOC80/system.perspective.sendMessage) with the session scope (“session”) so that your Views can “hear” the message.