AnandTech is a good source of hardware news and information. In lesson 15 we learned to pass a single name and value pair, but you can create a query string with multiple parameters. You can also assign multiple values to one parameter. To retrieve this information we can use the Count property to count the number of values of the parameter. When to use query strings and when not to.
Query strings are best at sending small pieces of information between pages.
For larger amounts of data, consider using forms instead.