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[DllImport("coredll.dll", EntryPoint="CeRunAppAtTime", SetLastError=true)]  

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private static extern bool CeRunAppAtTime(string pwszAppName, byte[] lpTime);

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    Public Declare Function CeRunAppAtTime Lib "coredll" _

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    If CeRunAppAtTime(FullAppName, WakeUpTime) Then

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        MessageBox.Show("Call to CeRunAppAtTime failed")

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       Dim cancelapp as boolean = CeRunAppAtTime(FullAppName, Nothing)

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Documentation

[CeRunAppAtTime] on MSDN