Mapfile variable substitution

[Stephen Davies]

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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Stephen Davies Consulting                            Voice: 08-8177 1595
Adelaide, South Australia.                             Fax: 08-8177 0133
Computing & Network solutions.                       Mobile:0403 0405 83
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