Question about cursor as stored procedure parameter

[Justin Chu]

I'm encountering similar code as this

CREATE OR REPLACE PACKAGE mypkg IS
  TYPE customer IS RECORD (
    firstname VARCHAR2(30),
    lastname  VARCHAR2(30)
  ); -- 1
  TYPE customerCursorType IS REF CURSOR RETURN customer;    -- 2
END mypkg;

I understand (1), but can someone explain the meaning of declaration (2)?

A procedure which uses the above as a parameter.

CREATE OR REPLACE PROCEDURE findCustomers(
  custCursor      OUT mypkg.customerCursorType   -- 3
) AS
   -- Define more variables
BEGIN
  BEGIN
    -- Open and write to OUT cursor
    OPEN custCursor FOR
      -- ... ...
    RETURN;
  END
END findCustomers;

A few questions:
What does (3) mean?
Since the cursor is declared as a package public/global object, is it true that I cannot/should not concurrently run this procedure?
What is a better way to write this?
[ February 23, 2007: Message edited by: Chu Tan ]

[Srinivasa Raghavan]

I understand (1), but can someone explain the meaning of declaration (2)?

Ref cursors are used for returning record sets from a stored procedure.