Can older version of SQL Server be installed side by side with newer version of SQL Server?

Can earlier version of SQL Server (SQL Server 2008 to SQL Server 2012) be installed side by sideAFTER newer version of SQL Server has been installed on the same machine?  If the answer will vary depending on components, please specify if possible.

Note: I have read the article Considerations for Side-by-Side Instances of SQL 2008 R2 and SQL Server 2008.

Thanks.