Global stored procedure

I have my doubts that many of us have been used this system stored procedure(sp_MS_marksystemobject) to resolve the problems. But it exists and gives you an ability to return the data in the scope of selected database. Well, across number of databases having one table with the same structure and being in the scope of desired database you'll return the data (by using the following stored procedure) from the table located in desired database.To make the stored procedure to recognize the 'desired' data we use sp_MS_marksystemobject system stored procedure. BTW, it works as well as on SQL Server 2000 and on SQL Server 2005(SP2).

USE master
CREATE TABLE test (c1 VARCHAR(50))
INSERT test VALUES('master')
go
CREATE PROC sp_test AS
SELECT * FROM test
GO
USE northwind
CREATE TABLE test (c1 VARCHAR(50))
INSERT test VALUES('northwind')
USE pubs
CREATE TABLE test(c1 VARCHAR(50))
INSERT test VALUES('pubs')
USE pubs
EXEC sp_test --returns 'master'
USE master
EXEC sp_MS_marksystemobject sp_test
USE pubs
EXEC sp_test --returns 'pubs'
USE northwind
EXEC sp_test --returns 'northwind'