High Quality Content by WIKIPEDIA articles! X/Open Company, Ltd. was a consortium founded by several European UNIX systems manufacturers in 1984 to identify and promote open standards in the field of information technology. More specifically, the original aim was to define a single specification for operating systems derived from UNIX, to increase the interoperability of applications and reduce the cost of porting software. Its original members were Bull, ICL, Siemens, Olivetti, and Nixdorf—a group sometimes referred to as BISON. Philips and Ericsson joined soon afterwards, at which point the name X/Open was adopted. The group published its specifications under the name X/Open Portability Guide (or XPG). Issue 1 covered basic operating system interfaces, and was published within a year of the group's formation.

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