# 8.02 system.gui.messageBox Functionally

**URL:** <https://forum.inductiveautomation.com/t/8-02-system-gui-messagebox-functionally/26665>\
**Category:** Ignition\
**Created:** [July 18, 2019, 2:00pm UTC](https://forum.inductiveautomation.com/t/8-02-system-gui-messagebox-functionally/26665 "2019-07-18T14:00:56Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\
**Post date:** [July 18, 2019, 3:24pm UTC](https://forum.inductiveautomation.com/t/8-02-system-gui-messagebox-functionally/26665/2 "2019-07-18T15:24:11Z")

</div>

`system.gui.messageBox` is a _modal_ interrupt - meaning that it blocks everything on the ‘Event Dispatch Thread’ (a Java Swing UI concept). _All_ script handling will be interrupted, unless you’ve specifically created an asynchronous thread before calling your message box.

---

_[View the full topic](https://forum.inductiveautomation.com/t/8-02-system-gui-messagebox-functionally/26665)._