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Xvfb is an X server that can run on machines with no display hardware and no physical input devices. It emulates a dumb framebuffer using virtual memory.
In IBM Ported Tools for z/OS V1.2, the Xvfb code is delivered as a separate FMID, HVFB111 and is available only with the IBM Ported Tools for z/OS, which is FMID HOS1120. The Xvfb for z/OS code in FMID HVFB111 is the same code that was available as PTFs UA21819 and UA32671 with IBM Ported Tools for z/OS V1.1. The Xvfb for z/OS code is delivered as a separate FMID in order to allow IBM to provide more efficient support.
 IBM Ported Tools for z/OS: Xvfb User's Guide PDF
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