[smotrs]

SetVolume is a program that gives the look and feel of the HTC volume in the Sense version of Manila. Without it, then you get the old Microsoft Volume controls. Your choice if you want to kill it.

Showcase gives you a Taskmanager like the old TM that ran on the 6.1 versions. When you touch the clock in the upper right corner, you are presented with a close button (which actually closes the app) as well as two others for displaying the TM to close other running apps and such.

I believe the NK.exe is the OS kernel itself, you definitely need that.