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Originally published in Handheld Systems, Vol 5.5 Whenever your programs have to deal with existing data formats or commonly used algorithms, you are faced with the choice between »reimplementing the wheel« or trying to use code that other people (or yourself) have written before. The…

Originally published in Handheld Systems, Vol 5.3 The Nokia 9000 Communicator was the latest publicly available addition to the family of handheld devices running the Geos operating system. Even though the Communicator had already been introduced on the CeBit 96 trade show last spring, it…

Originally published in Handheld Systems, Vol 5.2 "No man is an island", they say, and neither is, in most cases, a PDA. Especially when custom software is involved, there are numerous reasons why data has to be exchanged between a portable device an the rest…

Originally published in Handheld Systems, Vol 5.1 Testing and debugging application is not exactly what developers would call their favorite passtime. On the other hand, most will agree that finding problems is an integral part of any development process. For this reason, it is important…

Originally published in Handheld Systems, Vol 4.6 One of the reasons why Geos has been quite successful as an operating system for low-cost handheld devices is that its appetite for resources (CPU horsepower as well as memory) is relatively modest. On the other hand, this…