When the app is initially installed, ALL Contact, Account and Lead records will be processed for the initial match and sync using the Salesforce Batch API service.
We process through all records and attempt to match your records to our Infogroup data. When matches are found, we call back to a metadata API to install and sync the record (Account or Contact) data into the Infogroup custom object fields which are licensed to each client, and populate the records where there is a match.