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

via XAS environment variables
via keywords in XAS file headers
via communication channels

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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sax.iasf-milano.inaf.it/Xashelp/xasenv.html :: original creation 2002 Sep 04 17:38:12 CEST :: last edit 2002 Sep 04 17:38:12 CEST