Editing Xenix (section)

==Features==
Aside from its AT&T Unix base, Xenix incorporated elements from [[Berkeley Software Distribution|BSD]], notably the [[Vi (text editor)|vi]] text editor and its supporting libraries ([[termcap]] and [[curses (programming library)|curses]]).<ref name="ibm"/> Its kernel featured some original extensions by Microsoft, notably [[file locking]] and [[Semaphore (programming)|semaphores]],<ref name="ibm"/><ref name="intel"/>{{rp|1.12}} while to the [[User space|userland]] Microsoft added a "visual shell" for [[Menu (computing)|menu-driven]] operation instead of the traditional [[UNIX shell]].<ref name="ibm"/> A limited form of local networking over serial lines ([[RS-232]] ports) was possible through the "micnet" software, which supported file transfer and [[electronic mail]], although [[UUCP]] was still used for networking via [[modem]]s.<ref name="ibm"/>

OEMs often added further modifications to the Xenix system.<ref name="ibm"/><ref name="intel"/>