|IDL Reference Guide: Functional List of IDL Routines|
SCOPE_LEVEL - Returns the current routine's scope level.
SCOPE_TRACEBACK - Returns the current interpreter call stack (the sequence of routine calls to the present point).
SCOPE_VARFETCH - Returns variables outside the current routine's local scope.
SCOPE_VARNAME - Returns the names of variables outside current routine's local scope.
IDL Online Help (March 06, 2007)