open source operating system

This tag covers open source operating system development as represented by ReactOS, a Windows-compatible project working to expand compatibility with newer Windows software. The featured update describes a kernel and NTDLL implementation of NtGetCurrentProcessorNumberEx, ReactOS’s first NT6-era system call. Although the function simply reports the logical processor running a thread, the change is significant because it moves the project beyond its earlier Windows XP and Server 2003 focus toward Vista-and-later application compatibility. Readers browsing this tag can follow technical milestones in ReactOS’s effort to recreate Windows behavior through open-source kernel and system-library development.