A MicroContent Client allows a user to manipulate and manage MicroContent. This can be MicroContent created by himself or created by others; it can reside on a local computer, an attached device, on the local network or on the Internet. A client can offer various functions to the user: viewing, editing, creating, publishing, etc.
Basically a user has the choice from an application or a service. An application resides on his device and has all the application logic locally. A service resides on the Internet and the user interacts with the service through a browser. In the case of the service the logic resides on the Internet as well.
There is a tendency to merge these two approaches. One might call these application/services a hybrid (3083). They are sometimes called webaware desktop applications (3118). Examples of such hybrids under MacOSX are iTunes, iPhoto, DeliciousLibrary and WebnoteHappy.