# Basic question about underscore

**URL:** <https://forum.kirupa.com/t/basic-question-about-underscore/211657>\
**Category:** flash\
**Created:** [January 4, 2007, 12:11am UTC](https://forum.kirupa.com/t/basic-question-about-underscore/211657 "2007-01-04T00:11:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![NeoDreamer](https://avatars.discourse-cdn.com/v4/letter/n/ccd318/32.png) [@NeoDreamer](https://forum.kirupa.com/u/NeoDreamer)\
**Post date:** [January 4, 2007, 12:11am UTC](https://forum.kirupa.com/t/basic-question-about-underscore/211657/1 "2007-01-04T00:11:20Z")

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example: \_root.\_xmouse;

Can somebody explain to me when to use underscore \_ and when not to use underscore?