V$TOPLEVELCALL definition in Oracle Database 11.2
V$TOPLEVELCALL

select
  top_level_call#,                         -- TOP_LEVEL_CALL# NUMBER
  top_level_call_name                      -- TOP_LEVEL_CALL_NAME VARCHAR2(64)
from
  gv$toplevelcall
where
  inst_id = USERENV('Instance')

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