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Determine What An Identifier Refers To
Syntax which name
See Also active , user
Abbreviation wh
Menu Command Debug | Which

Searches the current environment to determine what the specified name refers to. O-Matrix and Mlmode keywords and intrinsic functions are checked for as well as a variable with the specified name. In addition, the current O-Matrix path is searched for a file named name.oms.

If you enter
     which colsum
O-Matrix will respond
If on the other hand you enter
     which PI
O-Matrix will respond
     PI is a constant