Abstract: An electronic commerce system includes a broker that enables customers to purchase items from merchants. A customer interacts with the merchant to identify items to purchase, and the merchant directs the customer to the broker in order to complete the transaction. The broker receives a description of a virtual shopping cart generated by the merchant and presents the customer with an interface allowing the customer to select shipping and other options for the purchase. The broker calculates a total amount for the transaction based on the shopping cart description and the options selected by the customer. The broker informs the merchant of the purchase and coordinates the shipment of the purchased items from the merchant to the customer.

Abstract: A restricted web site has features that are selectively exposed to clients. A screening web site interacts with clients and collects data about the clients using passive and/or active techniques. The screening site generates a token for the client, and includes data in the token identifying the token and describing the client. The token is encoded in a cookie and saved in the client's web browser. The client subsequently provides the token to the restricted site. The restricted site validates the token to ensure that it is legitimate, has not expired, and has not been used before. The restricted site selects one or more features to provide to the client based on the data about the client in the token and/or on other information. If the client does not present a token or the token is invalid, the restricted site does not expose any features to the client.

Abstract: A micro-payment system has buyers, sellers, and a broker. The buyers establish accounts with the broker and provide payment information allowing the broker to invoice the buyers. The sellers establish accounts with the brokers and specify terms for accessing items, including electronic content, available from the sellers. The sellers also provide payment information that allows the broker to credit the sellers for sales of the items. The broker aggregates the buyers' micro-payment purchases and invoices the buyers. The broker also aggregates the sellers' micro-payment sales and credits the sellers.

Abstract: A restricted web site has features that are selectively exposed to clients. A screening web site interacts with clients and collects data about the clients using passive and/or active techniques. The screening site generates a token for the client, and includes data in the token identifying the token and describing the client. The token is encoded in a cookie and saved in the client's web browser. The client subsequently provides the token to the restricted site. The restricted site validates the token to ensure that it is legitimate, has not expired, and has not been used before. The restricted site selects one or more features to provide to the client based on the data about the client in the token and/or on other information. If the client does not present a token or the token is invalid, the restricted site does not expose any features to the client.

Abstract: A micro-payment system has buyers, sellers, and a broker. The buyers establish accounts with the broker and provide payment information allowing the broker to invoice the buyers. The sellers establish accounts with the brokers and specify terms for accessing items, including electronic content, available from the sellers. The sellers also provide payment information that allows the broker to credit the sellers for sales of the items. The broker aggregates the buyers' micro-payment purchases and invoices the buyers. The broker also aggregates the sellers' micro-payment sales and credits the sellers.

Abstract: A micro-payment system has buyers, sellers, and a broker. The buyers establish accounts with the broker and provide payment information allowing the broker to invoice the buyers. The sellers establish accounts with the brokers and specify terms for accessing items, including electronic content, available from the sellers. The sellers also provide payment information that allows the broker to credit the sellers for sales of the items. The broker aggregates the buyers' micro-payment purchases and invoices the buyers. The broker also aggregates the sellers' micro-payment sales and credits the sellers.

Abstract: A micro-payment system has buyers, sellers, and a broker. The buyers establish accounts with the broker and provide payment information allowing the broker to invoice the buyers. The sellers establish accounts with the brokers and specify terms for accessing items, including electronic content, available from the sellers. The sellers also provide payment information that allows the broker to credit the sellers for sales of the items. The broker aggregates the buyers' micro-payment purchases and invoices the buyers. The broker also aggregates the sellers' micro-payment sales and credits the sellers.

Abstract: A micro-payment system has buyers, sellers, and a broker. The buyers establish accounts with the broker and provide payment information allowing the broker to invoice the buyers. The sellers establish accounts with the brokers and specify terms for accessing items, including electronic content, available from the sellers. The sellers also provide payment information that allows the broker to credit the sellers for sales of the items. The broker aggregates the buyers' micro-payment purchases and invoices the buyers. The broker also aggregates the sellers' micro-payment sales and credits the sellers.

Abstract: A micro-payment system has buyers, sellers, and a broker. The buyers establish accounts with the broker and provide payment information allowing the broker to invoice the buyers. The sellers establish accounts with the brokers and specify terms for accessing items, including electronic content, available from the sellers. The sellers also provide payment information that allows the broker to credit the sellers for sales of the items. The broker aggregates the buyers' micro-payment purchases and invoices the buyers. The broker also aggregates the sellers' micro-payment sales and credits the sellers.

Abstract: A restricted web site has features that are selectively exposed to clients. A screening web site interacts with clients and collects data about the clients using passive and/or active techniques. The screening site generates a token for the client, and includes data in the token identifying the token and describing the client. The token is encoded in a cookie and saved in the client's web browser. The client subsequently provides the token to the restricted site. The restricted site validates the token to ensure that it is legitimate, has not expired, and has not been used before. The restricted site selects one or more features to provide to the client based on the data about the client in the token and/or on other information. If the client does not present a token or the token is invalid, the restricted site does not expose any features to the client.

Abstract: An electronic commerce system includes a broker that enables third parties to create their own independent shopping carts including items from one or more merchants and/or items for group shopping. An agent, customer, or merchant can create and store a shopping cart containing one or more items. One or more customers can view the shopping cart to determine whether to purchase the item(s). To make the purchase, the customer(s) are transferred to a broker for the checkout. Where there is more than one customer, the customers can pledge to pay a portion of the total price for the cart. The customer(s) can purchase the items in the shopping cart in a single purchase transaction with the broker, rather than having to deal with each of the merchants. The broker interacts with the merchants to complete the transaction and can charge the customer(s) the appropriate amount or portion pledged.

Abstract: An electric commerce system includes a broker that enables third parties to create their own independent shopping carts including items from multiple different merchants. An agent creates and stores a shopping cart containing a plurality items from one or more merchants. The customer can view the shopping cart displayed by the agent to determine whether to make a purchase. If the customer indicates a desire to purchase the items in the cart, the customer is transferred to a broker for the checkout and purchase process. The customer can purchase the items in the shopping cart in a single purchase transaction with the broker, rather than having to deal with each of the merchants. The broker interacts with the merchants to complete the purchase transaction by which the customer buys the items in the cart.

Abstract: A restricted web site has features that are selectively exposed to clients. A screening web site interacts with clients and collects data about the clients using passive and/or active techniques. The screening site generates a token for the client, and includes data in the token identifying the token and describing the client. The token is encoded in a cookie and saved in the client's web browser. The client subsequently provides the token to the restricted site. The restricted site validates the token to ensure that it is legitimate, has not expired, and has not been used before. The restricted site selects one or more features to provide to the client based on the data about the client in the token and/or on other information. If the client does not present a token or the token is invalid, the restricted site does not expose any features to the client.

Abstract: An electronic commerce system includes a broker that enables customers to purchase items from merchants. A customer interacts with the merchant to identify items to purchase, and the merchant directs the customer to the broker in order to complete the transaction. The broker receives a description of a virtual shopping cart generated by the merchant and presents the customer with an interface allowing the customer to select shipping and other options for the purchase. The broker calculates a total amount for the transaction based on the shopping cart description and the options selected by the customer. The broker informs the merchant of the purchase and coordinates the shipment of the purchased items from the merchant to the customer.

Abstract: An electronic commerce system includes a broker that enables customers to purchase items from merchants. A customer interacts with the merchant to identify items to purchase, and the merchant directs the customer to the broker in order to complete the transaction. The broker receives a description of a virtual shopping cart generated by the merchant and presents the customer with an interface allowing the customer to select shipping and other options for the purchase. The broker calculates a total amount for the transaction based on the shopping cart description and the options selected by the customer. The broker informs the merchant of the purchase and coordinates the shipment of the purchased items from the merchant to the customer.

Abstract: An electric commerce system includes a broker that enables third parties to create their own independent shopping carts including items from multiple different merchants. An agent creates and stores a shopping cart containing a plurality items from one or more merchants. The customer can view the shopping cart displayed by the agent to determine whether to make a purchase. If the customer indicates a desire to purchase the items in the cart, the customer is transferred to a broker for the checkout and purchase process. The customer can purchase the items in the shopping cart in a single purchase transaction with the broker, rather than having to deal with each of the merchants. The broker interacts with the merchants to complete the purchase transaction by which the customer buys the items in the cart.