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Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for control of beverage dispensing. In one aspect, authorization data specifying that a beverage dispensing node is authorized to be activated are received. Activation data that request activation of t

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for control of beverage dispensing. In one aspect, authorization data specifying that a beverage dispensing node is authorized to be activated are received. Activation data that request activation of the node are also received, where activation of the node causes a valve that controls flow of fluid to a beverage dispenser to be opened. A determination is made that the activation data are associated with a user identifier for an enabled user, where an enabled user is a user that has been enabled to activate the node. In response to receipt of the authorization data and the activation data a valve that controls flow of fluid to the beverage dispenser is opened. Data (e.g., de-authorization or de-activation data) specifying that an activated beverage dispensing apparatus be de-activated can also be received. In response to receipt of the data, the valve can be closed.

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1. A method performed by data processing apparatus, the method comprising: obtaining, by a data processing apparatus and from a data store, configuration data specifying a multi-tier activation scheme that must be met for a beverage dispensing node to be enabled to dispense beverages, the multi-tier

1. A method performed by data processing apparatus, the method comprising: obtaining, by a data processing apparatus and from a data store, configuration data specifying a multi-tier activation scheme that must be met for a beverage dispensing node to be enabled to dispense beverages, the multi-tier activation scheme specifying that activation data requesting activation of the beverage dispensing node by a first entity authorized to activate the node will enable the beverage dispensing node only when received subsequent to receipt of authorization data from a second entity;receiving, by a data processing apparatus and from an enabled user, activation data that requests activation of the node from the first entity, wherein the activation of the beverage dispensing node causes a valve located between a beverage source and a beverage dispenser to be opened independent of a request to dispense a beverage at the beverage dispenser, wherein the beverage dispenser is a device that controls dispensing of a beverage when the valve is open;determining, by a data processing apparatus, whether authorization data was received from the second entity prior to receiving the activation data from the first entity;selecting, by a data processing apparatus, an activation state for the beverage dispensing node based on the determination and the obtained configuration data, an activation state of activated being selected in response to determining that the authorization data was received prior to the activation data, and an activation state of de-activated being selected in response to determining that the authorization data was not received prior to the activation data, wherein the de-activated state corresponds to the valve being closed; andopening the valve located between the beverage source and the beverage dispenser when the activated state is selected. 2. The method of claim 1, further comprising: receiving data requesting deactivation of the beverage dispensing node;determining that the received data are associated with a user identifier for an enabled user, the enabled user being a user that has been enabled to de-activate the beverage dispensing apparatus; andin response to receipt of the data, closing the valve located between the beverage source and the beverage dispenser. 3. The method of claim 2, wherein: receiving data comprises receiving de-authorization data from the second entity specifying that the beverage dispensing apparatus is no longer authorized to be activated; andthe second entity is a manager or supervisor of the first entity. 4. The method of claim 2, wherein receiving data comprises receiving de-activation data specifying that the beverage dispensing apparatus is disabled for beverage dispensing. 5. The method of claim 1, wherein opening a valve comprises opening an electronic control valve that controls flow of fluid between the beverage source and the beverage dispenser, the method further comprising: dispensing a beverage when the beverage dispenser is in an open state; andpreventing beverage dispensing when the beverage dispenser is in a closed state. 6. The method of claim 5, wherein opening the electronic control valve comprises actuating a strike and hold valve that opens in response to a minimum specified current and remains open as long as a second current is maintained, the second current being less than the minimum specified current. 7. The method of claim 1, further comprising: determining that the activation data has been received during a valid period, the valid period being a period during which activation data are considered valid, wherein opening a valve comprises actuating the valve in response to: receipt of the authorization data,the determination that the activation data are associated with a user identifier for a user, andthe determination that the activation data has been received during the valid period. 8. The method of claim 7, wherein determining that the activation data has been received during a valid period comprises: receiving a schedule of one or more valid periods; anddetermining that a time at which the activation data was received was during a valid period according to the schedule of one or more valid periods. 9. The method of claim 8, wherein receiving a schedule of one or more valid periods comprises receiving an event schedule for an event venue, each event in the event schedule having a start time representing a start of the valid period for the event and a stop time representing an end of the valid period for the event. 10. The method of claim 9, wherein the stop time for the event is a time prior to the end of the event. 11. The method of claim 10, wherein the stop time is a time at which a specified event occurs. 12. The method of claim 1, further comprising: receiving game data specifying that a game has reached a specified point at which beverage dispensing is restricted, the received game data being independent of a time of day clock; andde-activating the beverage dispensing node based on the receipt of the game data. 13. The method of claim 12, wherein receiving game data comprises receiving, from a game clock that functions independent of a time of day clock, data indicating that a specified portion of the game has been played. 14. The method of claim 13, wherein: receiving data indicating that a specified portion of the game has been played comprises receiving data specifying that a specified portion of a football game has been played; andde-activating the beverage dispensing node comprises de-activating beer vending stations in a venue of the football game. 15. The method of claim 1, further comprising: tracking an amount of fluid that has been dispensed by the beverage dispenser; andproviding reporting data specifying the amount of fluid that has been dispensed by the beverage dispenser. 16. The method of claim 15, wherein providing reporting data comprises providing the reporting data according to a reporting schedule, in response to a request for the reporting data, or in response to a change in the amount of fluid dispensed. 17. The method of claim 1, further comprising: monitoring system diagnostics for a system in which the beverage dispensing node is installed; andproviding diagnostic data specifying the system diagnostics. 18. The method of claim 17, wherein providing diagnostic data comprises providing data specifying at least one of a flow meter operating condition, a measure of available memory, a valve status, a beverage temperature, a beverage dispenser status, a fluid pressure, and a beverage container status. 19. The method of claim 17, wherein providing the diagnostic data comprises providing the diagnostic data by at least one of e-mail and text message. 20. The method of claim 1, comprising receiving the authorization data from a user device that is registered on a different local area network than the data processing apparatus. 21. The method of claim 1, comprising receiving the authorization data from a mobile device communicating over a mobile communications network. 22. A system comprising: a data storage device that stores configuration data specifying a multi-tier activation scheme that must be met for a beverage dispensing node to be enabled to dispense beverages, the multi-tier activation scheme specifying that activation data requesting activation of the beverage dispensing node by a first entity authorized to activate the node will enable the beverage dispensing node only when received subsequent to receipt of authorization data from a second entity; anda beverage dispensing apparatus configured to interact with the data storage device and perform operations comprising: obtaining the configuration data from the data storage device;receiving activation data that requests activation of the node, wherein activation of the node from the first entity, wherein the activation of the beverage dispensing node causes a valve located between a beverage source and a beverage dispenser to be opened independent of a request to dispense a beverage at the beverage dispenser, wherein the beverage dispenser is a device that controls dispensing of a beverage when the valve is open;determining whether authorization data was received from the second entity prior to receiving the activation data from the first entity;selecting an activation state for the beverage dispensing node based on the determination and the obtained configuration data, an activation state of activated being selected in response to determining that the authorization data was received prior to the activation data, and an activation state of de-activated being selected in response to determining that the authorization data was not received prior to the activation data, wherein the de-activated state corresponds to the valve being closed; andopening the valve located between the beverage source and the beverage dispenser when the activated state is selected. 23. The system of claim 22, wherein the beverage dispensing apparatus include an electronic control valve that is opened in response to receipt of the authorization data and the activation data. 24. The system of claim 23, wherein the electronic control valve is a strike and hold valve that opens in response to a strike current and remains open as long as a hold current is maintained, the hold current having a lower magnitude than the strike current. 25. The system of claim 22, wherein the beverage dispensing apparatus includes a flow meter that measures a flow of fluid to the beverage dispenser. 26. The system of claim 22, wherein the beverage dispensing apparatus includes a thin client that interacts with one or more data processing devices over a distributed network. 27. The system of claim 22, wherein the beverage dispensing apparatus includes a controller that generates one or more control signals with which the valve that controls flow of fluid to the beverage dispenser is controlled. 28. The system of claim 22, wherein the beverage dispensing apparatus includes a control interface with which the activation data are received. 29. The system of claim 28, wherein the control interface is an RFID interface that detects an RFID card on which activation data are stored. 30. A non-transitory computer storage medium encoded with a computer program, the program comprising instructions that when executed by data processing apparatus cause the data processing apparatus to perform operations comprising: obtaining configuration data specifying a multi-tier activation scheme that must be met for a beverage dispensing node to be enabled to dispense beverages, the multi-tier activation scheme specifying that activation data requesting activation of the beverage dispensing node by a first entity authorized to activate the node will enable the beverage dispensing node only when received subsequent to receipt of authorization data from a second entity;receiving activation data that requests activation of the node from the first entity, wherein the activation of the beverage dispensing node causes a valve located between a beverage source and a beverage dispenser to be opened independent of a request to dispense a beverage at the beverage dispenser, wherein the beverage dispenser is a device that controls dispensing of a beverage when the valve is open;determining whether authorization data was received from the second entity prior to receiving the activation data from the first entity;selecting an activation state for the beverage dispensing node based on the determination and the obtained configuration data, an activation state of activated being selected in response to determining that the authorization data was received prior to the activation data, and an activation state of de-activated being selected in response to determining that the authorization data was not received prior to the activation data, wherein the de-activated state corresponds to the valve being closed; andopening the valve located between the beverage source and the beverage dispenser when the activated state is selected. 31. A method comprising: receiving, by one or more data processing apparatus, game data specifying that a game has reached a specified point at which beverage dispensing is restricted, the received game data being independent of a time of day clock; andde-activating a plurality of beverage dispensing nodes based on the receipt of the game data, wherein: receiving game data comprises receiving, from a game clock that functions independent of a time of day clock, data indicating that a specified portion of the game has been played; andde-activating, by one or more data processing apparatus, the beverage dispensing node comprises de-activating beer vending stations in a venue of the game in response to receipt of the data.