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# Download SDK

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

To get a “hello world” sample app working:

  1. Extract helloworld.zip to helloworld/ somewhere

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

  3. Mount helloworld/app and name the drive 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!

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.

# Next steps