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We have developed an interface for editing and simulating Coloured Petri Nets based on toolglasses, marking menus and bi-manual interaction, in order to understand how novel interaction techniques could be supported by a new generation of user interface toolkits. The architecture of CPN2000 is based on three components: the Document Structure stores all the persistent data in the system; the Display Structure represents the contents of the screen and implements rendering and hit detection algorithms; and the Input Structure uses "instruments" to manage interaction. The rendering engine is based on OpenGL and a number of techniques have been developed to take advantage of 3D accelerated graphics for a 2D application. Performance data show that high frame rates have been achieved with off-theshelf hardware even with a non-optimized redisplay. This work paves the way towards a post-WIMP UI toolkit.

CPN/Tools is a major redesign of the popular Design/CPN tool from the University of Aarhus CPN group. The new interface is based on advanced, post-WIMP interaction techniques, including bi-manual interaction, toolglasses and marking menus and a new metaphor for managing the workspace. It challenges traditional ideas about user interfaces, getting rid of pull-down menus, scrollbars, and even selection, while providing the same or greater functionality. It also uses the new and much faster CPN simulator. The first internal release of CPN/Tools was made in April 2000 and the first public release is expected in October 2000. CPN/Tools requires an OpenGL graphics accelerator and will run on all major platforms (Windows, Unix/Linux, MacOS).

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The Western welfare model is under pressure and finding new ways of providing care is a key issue to maintain a reasonable service level for elderly people spending their last years at a nursing home. Personal care at nursing homes tends to (quite reasonably) have high priority at the expense of social activities, thus creating situations where a number of elderly people experience loneliness. This paper presents ongoing work that focuses on developing Information and Communication Technology (ICT) for nursing homes that brings together professional care activities and family initiated care. We discuss challenges and opportunities for welfare or assistive technology design to support articulation work in a care setting, where both care professionals and family members (of the elderly inhabitants) co-exists. Furthermore, the care sector at hand suffers from economical limitations that challenge a successful implementation of more costly technologies. We present a concept named Care to Share? that seeks to bring together professional and family initiated care and that assists in the articulation work of social activities in a nursing home.