system
6
Since this thread is entitled “Avast 6 Gadget” I have provided a link below from a MSFT website “Windows Desktop Gadgets”.
Information found on the link could be helpful in working with the Avast Gadget.
I highly recommend for those with the time.
The word count is 3,002 so if you know how fast you read semi-technical stuff you can figure out beforehand how long it will take you to read the page on the link. 
http://msdn.microsoft.com/en-us/library/dd834142.aspx