资 源 简 介
Typically, in an office building there exists some necessities in terms of transferring pack-
ages and documents, such as:
1. Postman needs to distribute some correspondence to some rooms or a postbox in a
daily basis. Therefore, he or she may need to dispatch this work to another person
or the final recipient may need to check the postbox regularly.
2. Moreover, in some cases, the correspondence is delivered to a wrong person. This in-
troduces unnecessary delays and worries to both the recipient and the postman/post
office.
3. Some collaborators in different offices (sometimes in different floors) need to share
documents between them.
4. Some big file transfers done by regular e-mail or by using a central server and the
building network lasts 2 or 3 hours1 .
5. For security reasons, some people do not trust network transfers (even when en-
crypted) for confidential files. That is why some institutions still prefer internal
regular mailing system.
6. Usually, departments have only
