Chapter 6: User Interfaces for Mobile Media 275 viewed at the same time by others; alternatively, the mobile device travels from hand to hand in a ring. In order to ease showing, some mobile devices have TV-out connectors for an external display. Also, there are accessories that are capable of receiving content via Bluetooth, and can be plugged into a TV set for easier viewing. Similarly, a headset plug connects the device to a home or car audio system, or the user may use an adapter to divide one plug into two. Or two users may share one head set. Somewhere between showing and sharing is a collaborative approach, where the user can share their view in real-time over the network for others to see. What is displayed in the view depends on the active application; it may be a slideshow or a web browser. The user can also share their audio to others at the same time. Furthermore, if the control to the view is also shared, it is possible to edit content objects collaboratively. Strictly speaking, sharing refers to a task where the user makes certain content objects available for download by others. Depending on the system and technologies in use, the user can grant access rights only to certain people and limit the number of simultaneous downloads. So far we have discussed sharing content with the people that the user is related to in some way. Publishing is heavily associated with uploading content on the Internet, where the user typically has less control over who can access the content. Publishing in a mobile blog is a good example of integration between mobile devices, applications, and Internet services. This seems to be an important evolution path in the mobile domain. For example, capture an image, launch a mobile device’s web browser, navigate to the bookmarked web page, and upload the image on a blogosphere. Depending on connection speed, the size of the newly created image, and other factors, this chain of operations may take as little time as 30 seconds, after which the recent shot is available for millions of people to view. We have discussed sharing digital content, but it is still important to be able to convert the content in a tangible, physical form that does not require any technical aids. Often this refers to printing of visual material, such as documents and images. However, printers are not integrated with mobile devices (at least not yet); they are an important part of the personal media ecosystem. Printing is done in different ways, depending on the available technology. For instance, the user may transfer the content with a memory card or over the Bluetooth connection to a PC. On the other hand, as discussed in section 4.9,