Here’s mushipkw’s first application to enable or disable Start Bar i.e. Top Bar.

At first its of no use… but one example is to use it with S2U2, assign StartBarEnable.exe to run whenever the device is unlocked by editing S2U2 registry settings & it’ll disable the Start Bar, Later you can enable it by running StartBarDisable.exe

http://forum.xda-developers.com/showthread.php?t=441221