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Windows 7 may be looking faster and more polished than its predecessor, Windows Vista, but both operating systems are nearly identical under the hood.

That means some of the application compatibility problems that plagued Vista users could also strike Windows 7 users, especially corporate workers.

While many software and game makers have fixed the XP apps that broke under Vista three years ago, the same isn't true of custom applications running inside enterprises.

Often written in Microsoft languages such as .Net or Visual Basic, these apps can suddenly become a

roadblock for enterprises intent on upgrading from XP to Windows 7, especially if they have thousands of them in use, said Chris Jackson, an associate software architect at Microsoft.

One solution is to run balky applications in virtualization, such as Windows 7's XP Mode or, for large enterprises, MED-V.

The disadvantage is that virtualized apps run slower, sometimes much slower. Also, companies may end up having to support the newer operating system as well as the one they upgraded from.

Enter shims, which are to programming what jujitsu is to hand-to-hand combat.

Essentially little bits of code, shims don't try to tackle app compatibility problems head-on, but use tricks to sidestep them.

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