USENIX Annual Technical Conference

The USENIX Annual Technical Conference (USENIX ATC, or, canonically, USENIX) is a conference of computing professions sponsored by the USENIX association. The conference includes computing tutorials, and a single track technical session for presenting refereed research papers, SIG meetings, and BoFs.
There have been several notable announcements and talks at USENIX. In 1995, James Gosling announced "Oak", which was to become the Java Programming Language. John Ousterhout first presented TCL here, and Usenet was announced here.
It is considered one of the most prestigious operating systems venues and has an 'A' rating from the Australian Ranking of ICT Conferences (ERA).
Technical Conferences.
Prior to 1995 there were two USENIX Technical Conferences held each year, with one held in the summer and the other during the winter.