A graphical user interface and a method for providing access to task data objects as well as a method for navigating through a set of task data objects is provided. The structure includes a first transistor coupled in series to a floating gate transistor whereby a source of the first transistor is coupled to a positive power supply voltage and a source of the floating gate transistor is coupled to a power supply ground. The inorganic particles as a dental material have an average particle diameter in the range from 1 to 10 \u03bcm, specific surface area in the range from 50 to 350 m2g, pore volume in the range from 0. The first SIP interworking function is configured to create a SDP2 based on the SDP1 and the local media information, create a SIP message comprising a message-body field including the SDP2 and an SIP extension header field including the SDP1, and send the SIP message to an IMS or SIP server. These two primary elements may be accommodated in an application-specific shipping container which support two shipping modes whereby the system may be shipped safely to and from a donor user each way in a different shipping mode.