Abstract: The performance of a network system having one or more requestor nodes, one or more provider nodes, and one or more intermediate nodes is improved by determining the digital signature of a received file, looking up the digital signature in an index of signatures, and forwarding a previously compressed version of the requested file when the digital signature is found in the index of signatures.

Abstract: Electronic messages may be processed using a stamp authority by receiving an electronic message, identifying a stamp associated the message, determining if the stamp is valid, and, if the stamp is determined to be valid, distinguishing the message from messages with which a valid stamp is not identified.

Abstract: An electronic message may be reconfigured to effect an enhanced notification using an input interface to receive at least one electronic message created by or on behalf of a message source for delivery to an intended recipient. A matching engine determines whether the electronic message corresponds to a predetermined definition of an enhanced notification. An enhancement engine reconfigures the electronic message to the enhanced notification if stored information related to the intended recipient indicates that the intended recipient is subscribed to receive the enhanced notification. Reconfiguring the electronic message may include reconfiguring the message to provide special handling, routing or presentation.

Abstract: A sender's degrees of separation from a recipient may be used to aid in spam filtering or to otherwise handle a communication. The “degrees of separation” represent a metric used to quantify whether/how the recipient is linked to the sender through intermediary people or other entities. For example, a recipient may know a first user (first degree of separation) and the first user may know a second user (second degree of separation) who knows the sender of an e-mail. In this case, the sender is separated from the recipient by two degrees of separation (by two other contacts). A level of “trust” or “legitimacy” about a sender's communication can be inferred by looking at whether the sender is linked to an intended recipient. Typically, user contact lists (e.g., address book, buddy list, and/or white list) are evaluated to determine the number of degrees (or hops) are required to link or relate two users.

Abstract: Enabling a recipient to control presentation of an audio identifier informing the recipient of an arrival of a digital communication from a sender in a communication session includes receiving a digital communication from a sender directed to a recipient. A sender-designated first audio identifier or sender-related information that identifies the sender to the recipient is accessed upon arrival of the digital communication. The first audio identifier or sender-related information is presented to the recipient contemporaneous with receipt of the digital communication. The recipient is able to specify, upon presentation of the first audio identifier or sender-related information, whether to enable subsequent presentation of the first audio identifier prior to or concurrent with receipt of a future digital communication from the sender.

Abstract: Informing a user of a large scale network dynamically of other network users includes determining dynamically an online context of the user. Other users presently within the online context of the user are identified and trait information is stored that is related essentially only to the user or to the other users in a users store associated with the online context. The user is informed dynamically of the other users based on the stored trait information, such as, for example, an age or other demographic identifier, or information indicative of an expertise, interest, preference, user type and/or other quality of the user or of the other individual.

Abstract: Providing supplemental information for an individual referenced in an electronic message typically includes receiving an electronic message, examining the electronic message, detecting an identifier for a referenced individual contained in the electronic message, and making supplemental information for the referenced individual available to a recipient of the electronic message. The supplemental information may include information that is in addition to information contained in the electronic message. The supplemental information may include at least one of an e-mail address, a screen name, a telephone number, a facsimile number, and a mailing address, each of which is associated with the referenced individual.

Abstract: A sender's degrees of separation from a recipient may be used to aid in spam filtering or to otherwise handle a communication. The “degrees of separation” represent a metric used to quantify whether/how the recipient is linked to the sender through intermediary people or other entities. A level of “trust” or “legitimacy” about a sender's communication can be inferred by looking at whether the sender is linked to an intended recipient. Typically, user contact lists (e.g., address book, buddy list, and/or white list) are evaluated to determine the number of degrees (or hops) are required to link or relate two users.

Abstract: A sender's degrees of separation from a recipient may be used to aid in spam filtering or to otherwise handle a communication. The “degrees of separation” represent a metric used to quantify whether/how the recipient is linked to the sender through intermediary people or other entities. A level of “trust” or “legitimacy” about a sender's communication can be inferred by looking at whether the sender is linked to an intended recipient. Typically, user contact lists (e.g., address book, buddy list, and/or white list) are evaluated to determine the number of degrees (or hops) are required to link or relate two users.

Abstract: Transferring instant messaging sessions includes receiving a selection, from a user within a user interface, of at least one instant messaging session from among multiple instant messaging sessions to transfer from a first instant messaging controller on a first device to at least a second instant messaging controller on a second device, where the user is signed on concurrently to the first instant messaging controller on the first device and the second instant messaging controller on the second device. At least a portion of the selected instant messaging session is transferred from the first instant messaging controller on the first device to the second instant messaging controller on the second device and the transferred portion of the instant messaging session is made perceivable on the second instant messaging controller on the second device.

Abstract: Detecting a physical location change of a mobile communications device may initiate a process to initiate, or cancel, forwarding of future incoming communications to the mobile communications device. Forwarding information for a mobile communications device may be accessed and modified using an interface that communicates using an Internet Protocol network.

Abstract: Audibly identifying an event includes enabling selection of a first sound based upon an identifier. The identifier enables identification of an entity related to the event. A notification of an occurrence of the event is received. The notification includes the identifier. An intended recipient is alerted of the event by playing, in response to the notification, at least a portion of the first sound and at least a portion of a second sound that is related to the event.

Abstract: Routing and displaying instant messages includes receiving a first request to establish a first instant messaging session associated with an instant messaging online identity assigned to a user using a first instant messaging controller. The first instant messaging session is established in response to the first request, where the first instant messaging session includes a first state. A second request from the user is received to establish a second instant messaging session associated with the instant messaging online identity assigned to the user using a second instant messaging controller that differs from the first instant messaging controller. The second instant messaging session is established in response to the second request, where the second instant messaging session includes a second state. An instant message designated for the instant messaging online identity assigned to the user is received and a determination is made on where to route the instant message based on routing criteria.

Abstract: In the event of an unintentional interruption, a token issued by a host system to a client system is used to reestablish communications without disrupting applications on the client system. If the host system provided an Internet Protocol address to the client system to be used during the interrupted communications session, the host system reserves the communications address during an interruption in communications for a period sufficient to permit reestablishment of communications using the reserved address.

Abstract: Informing a user of a large scale network dynamically of other network users includes determining dynamically an online context of the user. Other users presently within the online context of the user are identified and trait information is stored that is related essentially only to the user or to the other users in a users store associated with the online context. The user is informed dynamically of the other users based on the stored trait information, such as, for example, an age or other demographic identifier, or information indicative of an expertise, interest, preference, user type and/or other quality of the user or of the other individual.

Abstract: In the event of an unintentional interruption, a token issued by a host system to a client system is used to reestablish communications without disrupting applications on the client system. If the host system provided an Internet Protocol address to the client system to be used during the interrupted communications session, the host system reserves the communications address during an interruption in communications for a period sufficient to permit reestablishment of communications using the reserved address.

Abstract: Transferring instant messaging sessions includes receiving a selection, from a user within a user interface, of at least one instant messaging session from among multiple instant messaging sessions to transfer from a first instant messaging controller on a first device to at least a second instant messaging controller on a second device, where the user is signed on concurrently to the first instant messaging controller on the first device and the second instant messaging controller on the second device. At least a portion of the selected instant messaging session is transferred from the first instant messaging controller on the first device to the second instant messaging controller on the second device and the transferred portion of the instant messaging session is made perceivable on the second instant messaging controller on the second device.

Abstract: An incoming message and an indication of a sender-specified destination for the incoming message are received. In addition, a determination is made as to whether a mobile telephone number is known by the sender to be associated with the sender-specified destination. If a mobile telephone number is known by the sender to be associated with the sender-specified destination, a first message that is based on the incoming message is sent to the mobile telephone number. Furthermore, a second message is sent to the mobile telephone number that indicates that the first message was sent to the mobile telephone number based on a determination that the mobile telephone number is known by the sender to be associated with the sender-specified destination.

Abstract: Notifying a user of multiple concurrent instant messaging sessions includes receiving a first request to establish a first instant messaging session associated with an instant messaging online identity assigned to a user using a first instant messaging controller and establishing the first instant messaging session in response to the first request. A second request is received to establish a second instant messaging session associated with the instant messaging online identity assigned to the user using a second instant messaging controller that differs from the first instant messaging controller. The second instant messaging session is established in response to the second request. A notification is communicated to at least the first instant messaging controller indicating the establishment of the second instant messaging session.

Abstract: Controlling the volume of an audible alert associated with an instant messaging communications session includes rendering, on a first instant messaging user system, an instant messaging application user interface for an instant messaging communications session involving at least a first instant messaging user and a second instant messaging user, receiving notification of an event related to the instant messaging communications session, determining a characteristic of the event, accessing an audible alert to be rendered to signal existence of the event, adjusting based upon the determined characteristic of the event a volume of the audible alert corresponding to the event, and rendering the audible alert to signal existence of the event.