You can see all of your past purchases, or just the ones that are not currently on the device you're using.

There are also gaps in documentation turned over to the commission, including information on past purchases and old weapons programs.

Customers may ask you to complete a refund form to cover past purchases.

Amazon.Com, for example, has long used its records of customers' past purchases to recommend other items that they may like.

The company also sends out a bi-weekly newsletter advertising events which the subscriber may be interested in based on past purchases.

Sell your past purchases at Amazon.com today!

How about installing computers to create custom shopping lists based on past purchases?

By doing so, Etsy made any past purchase with feedback easily searchable, which caused many complaints.

Are they guessing, based on my past purchases, or is there some sort of technology at work here?

Amazon.com for instance, offers Instant Recommendations based on past purchases.