Mechanism for secure participation in a transaction by a third party

A computer program product for use in an environment that includes a coordinator computing entity, an initiator computing entity and a participant computing entity that may collaboratively interact to engage in a message transaction, the computer program product for implementing a method for the coordinator computing entity to securely allow the participant computing entity to engage in the transaction even though it is the initiator computing entity, rather than the participant computing entity, that initiates the transaction, the computer program product comprising one or more computer-readable media having computer-executable instructions that, when executed by one or more processors of the coordinator computing entity, cause the coordinator computing entity to perform the method, the method comprising the following:

• an act of accessing a coordination context for the transaction in response to having received a transaction initiation request from the initiator computing entity, the coordination context including information that may be used to register in the transaction including a secure key;
• an act of providing a transaction initiation response that includes the generated coordination context to the initiator computing entity;
• an act of detecting receipt of a registration request from the participant computing entity to register in the transaction, the registration request being secured using the secure key included in the coordination context;
• an act of determining that the participant computing entity is authorized to register in the transaction based at least in part on the registration request being secured by the secure key;
• and
• an act of registering the participant computing entity in the transaction as having a relationship in the transaction.

A computer program product for use in an environment that includes a coordinator computing entity, an initiator computing entity and a participant computing entity that may collaboratively interact to engage in a message transaction, the computer program product for implementing a method for the initiator computing entity to initiate the transaction while securely allow the participant computing entity to engage in the transaction even though it is the initiator computing entity, rather than the participant computing entity, that initiates the transaction, the computer program product comprising one or more computer-readable media having computer-executable instructions that, when executed by one or more processors of the initiator computing entity, cause the initiator computing entity to perform the method, the method comprising the following:

• an act of providing a transaction initiation request to the coordinator computing entity;
• an act of receiving a transaction initiation response from the coordinator computing entity, the transaction initiation response including a coordination context for the transaction, the coordination context including information that may be used to register in the transaction including a secure key, wherein the secure key may be used to secure registration requests for the transaction;
• and
• an act of providing the coordination context to the participant computing entity.

A computer program product for use in an environment that includes a coordinator computing entity, an initiator computing entity and a participant computing entity that may collaboratively interact to engage in a message transaction, the computer program product for implementing a method for the participant computing entity to securely engage in the transaction even though it is the initiator computing entity, rather than the participant computing entity, that initiates the transaction, the computer program product comprising one or more computer-readable media having computer-executable instructions that, when executed by one or more processors of the participant computing entity, cause the participant computing entity to perform the method, the method comprising the following:

• an act of detecting receipt of a coordination context for the transaction from the initiator computing entity, the coordination context including information that may be used to register in the transaction including a secure key;
• an act of generating a registration request to register in the transaction as having a relationship in the transaction, the registration being secured using the secure key;
• and
• an act of providing the secured registration request to the coordinator computing entity.