Windows XP Productivity Programs ?

I am debating between Windows 7 Home and Professional. What are some examples of Windows XP Productivity Programs that require Windows 7 Professional?

Few applications are developed that make a differentiation of whether it it a Pro or Home version of the OS software it is installed on. MS Home versions can be networked but are usually limited to a 5 system workgroup and cannot join a domain. Advanced security settings for file permissions and stuff are performed in safe mode. The Pro versions don't have these limitations.