You should read the kix2010.doc included in the KiX2010_453.zip package. It explains "Break", "@LOGONMODE" and all the switches used with "Copy".
Important to know is that in KiXtart, "Break" is per default "Off". This means that when you break a script, p.e. via Task Manager, your computer gets logged of. We (at least I) just presume this is wanted behaviour during Windows Logon.