st: all matrix names in namelist?

[Andrew Shephard <andrew_s@ifs.org.uk>]

Dear Stata users,

I am writing a program which (optionally) allows matrices to be passed 
as inputs. If the user specifies any matrices, then I will use these. 
However, if the user does not specify any matrices I wish to store the 
name of ALL matrices in a local, so my program can default to use these 
instead.

Does anybody know if it is possible to do this (store all matrix names 
in a local)?

Thanks very much for your help,

Andrew
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