Skipping Windows XP shut down


I am working on a kiosk project where the client will not have access to a power button or windows desktop. They may want to shut down every night by just killing the power.

How bad is this? If a Windows XP Pro based kiosk is simply unplugged every night, will we run into trouble? It seems like I’ve been able to do this to various computers many times with out issues.

Thanks for any thoughts on this.