Which Codeunit Calls when Open a Database

lakshman wrote:

Hi Experts,
My Requirement is To restrict to open a database if the database is already open with same userid. so that i want to know which codeunit calls when open a database.
(not a open company. when open company codeunit 1 called).please suggest me.
Thanks & Regards
lakshman

CREATE PROCEDURE KillGluttonUsers AS
DECLARE @Victim INTEGER
DECLARE @SQLCommand VARCHAR(30)
DECLARE _ToKill CURSOR LOCAL FAST_FORWARD FOR
  SELECT [Connection ID]
  FROM Session
  INNER JOIN (
    SELECT
      s.*, 
      (SELECT TOP 1 [Connection ID] FROM Session WHERE s.[User ID] = Session.[User ID] ORDER BY [Login Time]) AS FirstConnectionID
    FROM
    (
      SELECT COUNT(*) AS NoOfConnections, [User ID]
      FROM Session
      WHERE [Application Name] = 'Microsoft Business Solutions-Navision client' AND [Database Name] = db_name()
      GROUP BY [User ID]
      HAVING COUNT(*) > 1
     ) s
  ) k ON Session.[User ID] = k.[User ID] AND Session.[Connection ID] <> k.FirstConnectionID
  WHERE [Application Name] = 'Microsoft Business Solutions-Navision client' AND [Database Name] = db_name()

OPEN _ToKill
FETCH NEXT FROM _ToKill INTO @Victim
WHILE @@FETCH_STATUS = 0 BEGIN
  SET @SQLCommand = 'KILL ' + CAST(@Victim AS VARCHAR)
  EXEC (@SQLCommand)
  FETCH NEXT FROM _ToKill INTO @Victim
END
CLOSE _ToKill
DEALLOCATE _ToKIll