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Tech Report kmi-94-01 Abstract


Froglet: A Source Level Stepper for Lisp
Techreport ID: kmi-94-01
Date: 1994
Author(s): Stuart Watt
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Froglet is a source-level stepper for Common Lisp. Unlike previous steppers, which used pretty-printed reconstructions of definitions to show the progress of execution, Froglet uses the text from which the definition was read. This means that forms can be shown under evaluation in the right context, complete with comments and related functions. It also provides views onto the stack and onto the lexical environment of the form currently being evaluated. This paper describes the background to Froglet and how it is related to steppers for conventional languages, gives an overview of its implementation and interface, and shows that it could form a key addition to Lisp environments.
 
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Future Internet is...


Future Internet
With over a billion users, today's Internet is arguably the most successful human artifact ever created. The Internet's physical infrastructure, software, and content now play an integral part of the lives of everyone on the planet, whether they interact with it directly or not. Now nearing its fifth decade, the Internet has shown remarkable resilience and flexibility in the face of ever increasing numbers of users, data volume, and changing usage patterns, but faces growing challenges in meetings the needs of our knowledge society. Globally, many major initiatives are underway to address the need for more scientific research, physical infrastructure investment, better education, and better utilisation of the Internet. Within Japan, USA and Europe major new initiatives have begun in the area.

To succeed the Future Internet will need to address a number of cross-cutting challenges including:

  • Scalability in the face of peer-to-peer traffic, decentralisation, and increased openness

  • Trust when government, medical, financial, personal data are increasingly trusted to the cloud, and middleware will increasingly use dynamic service selection

  • Interoperability of semantic data and metadata, and of services which will be dynamically orchestrated

  • Pervasive usability for users of mobile devices, different languages, cultures and physical abilities

  • Mobility for users who expect a seamless experience across spaces, devices, and velocities