Open-source developer "Hailey" has introduced the Windows 9x Subsystem for Linux (WSL9X), which allows users to run both Windows and Linux applications simultaneously on classic versions of Windows, including Windows 95, 98, and Me. WSL9X operates by running a modern Linux kernel (6.19) alongside the Windows 9x kernel, enabling features such as paging, memory protection, and pre-emptive scheduling. It is neither emulation nor virtualization and does not require hardware virtualization. WSL9X is available for download, but users must build it from the source provided by Hailey. It allows access to a genuine Linux terminal alongside classic Windows applications, enabling various tasks without compromising system stability.