# Viewer existing window

**URL:** https://resource.dopus.com/t/viewer-existing-window/57918
**Category:** Help & Support
**Created:** [December 1, 2025, 5:13am UTC](https://resource.dopus.com/t/viewer-existing-window/57918 "2025-12-01T05:13:00Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![Nivve](https://resource.dopus.com/letter_avatar_proxy/v4/letter/n/77aa72/32.png) [@Nivve](https://resource.dopus.com/u/Nivve)
#### Post date: [December 1, 2025, 5:13am UTC](https://resource.dopus.com/t/viewer-existing-window/57918/1 "2025-12-01T05:13:00Z")

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In preference, I have enabled reuse viewer existing window. but there are some moment that I would like to compare images side by side. Any command let user toggle the function?

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### Author: ![lxp](https://resource.dopus.com/user_avatar/resource.dopus.com/lxp/32/33734_2.png) [@lxp](https://resource.dopus.com/u/lxp)
#### Post date: [December 1, 2025, 5:29am UTC](https://resource.dopus.com/t/viewer-existing-window/57918/2 "2025-12-01T05:29:27Z")

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You might like

> [@ShowMulti (Launch multiple viewers)](https://resource.dopus.com/t/showmulti-launch-multiple-viewers/41266):
>
> This add-in creates the custom command ShowMulti. It complements the built-in command Show by being able to launch more than one viewer at once. play_button JScript Usage By default, ShowMulti launches two viewers side-by-side on the current monitor and plac…

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### Author: ![Nivve](https://resource.dopus.com/letter_avatar_proxy/v4/letter/n/77aa72/32.png) [@Nivve](https://resource.dopus.com/u/Nivve)
#### Post date: [December 1, 2025, 8:18am UTC](https://resource.dopus.com/t/viewer-existing-window/57918/3 "2025-12-01T08:18:48Z")

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yes, this is good. thanks

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### Author: ![Leo](https://resource.dopus.com/user_avatar/resource.dopus.com/leo/32/69732_2.png) [@Leo](https://resource.dopus.com/u/Leo)
#### Post date: [December 1, 2025, 11:43am UTC](https://resource.dopus.com/t/viewer-existing-window/57918/4 "2025-12-01T11:43:57Z")

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For reference, the `Show USEEXISTING=no` command can be used to open a new viewer for the selected file(s) and override the Preferences setting about reusing existing ones.

(Lxp's add-in will do some other things like open viewers next to each other, so it's probably still what you want to open two viewers side by side. Just thought the info may be useful to someone searching the forum in future.)

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### Author: ![Nivve](https://resource.dopus.com/letter_avatar_proxy/v4/letter/n/77aa72/32.png) [@Nivve](https://resource.dopus.com/u/Nivve)
#### Post date: [December 1, 2025, 10:15pm UTC](https://resource.dopus.com/t/viewer-existing-window/57918/5 "2025-12-01T22:15:02Z")

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Oh great. I will keep that in mind.