# Getting started

This guide sets up a dev environment for apps and libraries in os.90s.dev

# Hello World

To getting a "hello world" sample app working:

1. Extract helloworld.zip to helloworld/

2. Open os.90s.dev/#sys/apps/filer.app.js

3. Mount helloworld/app as app and click it

4. Click helloworld.app.js (it may take a sec)

5. Open helloworld in your favorite IDE

6. Change some text or something

7. Click the app again in filer.app.js

Congratulations, your hello world app works!

# Next steps

The entire core and all system apps are included in the zip. This way you can see how the system works internally, and even fork and modify built-in apps.

Check out the Hello World guide for a full breakdown of the sample code.

# Sharing your creations

Made something you want to share with the community?

Check out the publishing apps and publishing libraries guides to learn more.