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Project is a combination of Vendors DB
and Items DB, which is a convinient way to open previously saved
DBs.
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Items DB is where all the information about
items is kept, such as Vendors names, Price, change in price,
etc.
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Vendors DB is where all the information
regarding Vendors is kept, such as search strings (which are used to find
price on Vendor's web-site), currency, etc.