If you use one of OpenMoko, you may have full linux at your disposal, and you can do everything the same way as on a resource limited to the desktop.
I donβt know if any are sold using a convenient keyboard.
Addit: This reminds me of the days of my Zaura when I had a full MySQL server, a web server, and ssh running on it.
This thing kicked a serious ass compared to the limited PocketWindowsCE stuff. Unfortunately, he got this ass seriously kicked in terms of PIM functionality, but the geek factor was worth it :)
AndreasT
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