TSQL Statement

[trevorc1653]

USE master;
GO
EXEC sp_addlinkedserver
'SEATTLESales',
N'SQL Server' -- the line I have a question about
GO

I got the above SQL statement from SQL Server Booksonline.
I've seen several statements that have an N before
a character string. I've been able to execute the
statements successfully with the inclusion of this N.
What is the purpose of the N?

[ssbp2we]

looks like its if the string after N is a unicode string. refer msdn.microsoft . com/en-us/library/ms182673 . aspx (Transact-SQL)