However, upper back pain is most often due to muscle irritation or joint problems and is usually not a cause for concern. Upper back pain occurring with other symptoms, such as chest pain or difficulty breathing, may be a sign of a heart attack and should be immediately evaluated in an emergency setting.
(Small Computer System Interface) Pronounced scuzzy, SCSI is a hardware interface for up to 15 peripherals connected to one PCI or PCI Express card (SCSI host adapter) on the motherboard. Introduced in 1986 by Shugart Associates (see SASI), this original parallel architecture was largely replaced by a serial version (see serial attached SCSI).
POSIX stands for Portable Operating System Interface for computing environments. POSIX began as an effort by the IEEE community to promote the portability of applications across UNIXÂ® environments by developing a clear, consistent, and unambiguous set of standards. However, POSIX is not limited to the UNIX environment. It can also be implemented on non-UNIX operating systems, as was done with the IEEE Standard 1003.1-1990 (POSIX.1) Implementations on Virtual Memory System (VMS), Multiprogramming Executive (MPE), and the Conversion Technology Operating System (CTOS).