sql server - What is the purpose of "::" in T-SQL -

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in (non-english) book on t-sql (sql server 2005) read about:

select * ::fn_helpcollations()

though, execution of without "::" 

select * fn_helpcollations()

in sql server 2008 r2 gives same result.

what "::" mean in t-sql?

from msdn:

however, when call sql server built-in functions return table, must add prefix :: name of function:

select * ::fn_helpcollations()

looks can omit :: in sql server 2005 , 2008. :: syntax supported backward compatibility.


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