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Trace Controls ⎕TRACE

Dyadic ⎕TRACE means

Set Trace Controls 

      +(0,⍳10) ⎕TRACE 'foo'
0 1 2 3 4 5

Monadic ⎕TRACE means

Query Trace Controls 

      ⎕TRACE 'foo'
0 1 2 3 4 5