| 摘要 |
<p>Contact information, such as an email address, may be known for some recipients, but may be unknown or out-of-date (or obsolete) for others. However, often a group of recipients are related to each other with potentially overlapping social networks. In such cases, data can be communicated directly to those recipients that are known or can otherwise be contacted directly, while relying on such "direct recipients" to act as one or more proxies for sending the data to the others in the group, e.g. using their local contact information. A server can also be used to provide updates to the originating device or provide access to the list as it evolves, to enable the originating device to see who has received the data even if they are unaware of how the data reached those other devices.</p> |
