USE AdventureWorks
GO

-- there needs to be a linked server, Eastserver
CREATE SYNONYM dbo.Customers_East ON Eastserver.Northwind.dbo.Customers
GO

CREATE SYNONYM dbo.Contact FOR Person.Contact
GO

-- use the one-part or two-part name
SELECT * FROM Contact
SELECT * FROM dbo.Customers_East
GO

USE Northwind
GO

-- use the three-part name 
SELECT * FROM AdventureWorks..Contact