Mapfile variable substitution

[Steve Lime]

I just added a quick howto on this subject to the new MapServer web-site. Here's the link:

  http://ms.gis.umn.edu/docs/howto/runsub 

Steve

>>> Stephen Davies <sdc at SDC.COM.AU> 11/10/05 2:40 AM >>>
I see several postings regarding mapfile variables which can and cannot 
be changed via substitution but cannot find a cannonical list.

Does such a beast exist?

I am particularly interested reference image and layer filter values 
(but would like to know what else can be changed this way).

Cheers and thanks,
Stephen
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