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wkix32.exe is functionally identical to kix32.exe except that it does not create a default console aka "DOS box" when it launches.
wkix32 is used for silent scripting when you don't want an ugly empty black window to pop up. wkix32 may still create a console under certain conditions.
The /B switch tells CMD.EXE not to start a new console, so serves a similar purpose.
The /W is (I assume) a synonym for /WAIT, and it tells CMD.EXE to wait for the command to complete. It's useful for commands that detach from the process that started them.
In this case if it is working as you expect then you don't need "START /W /B"
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