3. The XAS environment


The XAS system is unlike packages with an overarching monitor (like the MIDAS monitor or the IRAF cl) and also unlike monolithic programs like XSPEC, but is a collection of cooperating programs invoked from the usual Unix shell or VMS DCL prompt.

These program may communicate between each other in several ways


A XAS environment variable is assigned a value with the xasset command and is deleted using the xasunset command.
The interaction of XAS and system environments is described elsewhere.

One can also consult a list of all known global variables in alphabetic order or by subject.


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