Because of this simple software layer, the VistA software architecture has been able to adapt to changing hardware environments over the decades with only the minimum amount of software changes at higher levels of abstraction.
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The VA Kernel is a set of programs, developed by the Department of Veterans Affairs of the United States Government, which provide an operating system and MUMPS implementation independent abstraction to the VistA Hospital Information System.
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The CHCS system and the RPMS system have a Kernel as well, which provides a similar degree of support to those systems as the VA Kernel does to VistA.
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