That's because KiXtart started out as a logon script interpreter. You want your logon script to finish when a user logs on. If the user ends the script he/she is not authorized to log on and gets logged of.

Nowadays KiXtart is used for much more purposes then just logon scripts.

Anyway if you do like Gargoyle said the script can be ended at any time and you will stay logged on.
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Mart

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