1. Introduction
Mobile computing has become familiar for large user groups especially in the form of mobile phones. In addition to the conventional communication functions of mobile phones, i.e. call and messaging, they involve other functions, such as calendar and to-do notes, which are relevant for computer supported collaborative work (CSCW) and can be linked to concern the field of mobile computing in general. Mobile phones, which are inevitably used for distant communication, offer a potential platform for developing also other applications, which can assist in distant collaborative work.