OH, and don't take my word for it, try reading the manual.
Quote:

Note
By default, the Windows version of KiXtart 2001 runs as an asynchronous process. This means that if you start WKIX32.EXE from a batchfile, the batchfile will not wait for KiXtart to exit and will continue processing. This behavior can cause problems if KiXtart is being used as part of the logon process, especially on Windows 9x clients. To prevent these problems, WKIX32.EXE should be started from a batchfile using the START command with the wait option, e.g.: "START /W WKIX32.EXE". Optionally, on Windows NT or higher, you can also specify the /B option with the START command, to prevent the creation of an additional window.



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