How To Display Return Value From Stored Procedure Output Parameter In Query Analyzer

I tried to display return value from stored procedure output parameter in Query Analyzer, but I do not know how to do it. Below is my stored procedure:

CREATE PROCEDURE UserLogin
(
@Email nvarchar(100),
@Password nvarchar(50),
@UserName nvarchar(100) OUTPUT
)
AS

SELECT @UserName = Name FROM Users
WHERE Email = @Email AND Password = @Password
GO

If I run the query in Query Analyzer directly, I can display @UserName:

DECLARE @UserName as nvarchar(100)

SELECT @UserName = Name FROM Users
WHERE Email = @Email AND Password = @Password

Select @UserName

But how can I display @UserName if I call stored procedure:

exec UserLogin 'email', 'password', ''

I believed it return int, right?

Thanks in advance for help.