[ns] rookie's question

["s w" <nshowto@hotmail.com>]

Dear all,
Can anyone give some help on starting the simple sample? Thanks
I meet the error msg while trying to start the first sample, I don't know 
what's wrong with the syntax.
Thanks for help
% set ns tst
tst
% set nf [open out.nam w]
file1420d0
% $ns namtrace-all $nf
invalid command name "tst"
yanxu

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