If you have a custom HTA or dialog box as part of a task sequence, the dialog box could get in the way. And it’s quite annoying to manually drag it out-of-the-way every time. A workaround to this is to hide that task sequence dialog box altogether
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Read the complete post at http://t3chn1ck.wordpress.com/2012/04/09/hiding-a-task-sequence-progress-ui/