# system_type var (world)

Source: https://ref.dm-lang.org/world/var/system_type

This variable indicates the operating system type at run-time. It will be one of the following constants:

* MS_WINDOWS
* UNIX

### See also
- [byond_version var (world)](https://ref.dm-lang.org/world/var/byond_version.md)
- [process var (world)](https://ref.dm-lang.org/world/var/process.md)
- [shell proc](https://ref.dm-lang.org/proc/shell.md)