Portable in this context means that the application can be installed on a memory card or USB memory containing a file system and moved from device to device. There is no dependency on items stored on the host computer. There are no register entries required and it can run without needing any modifications to the host environment.
 Portable Apps
See Portable Apps for a way to create or find portable programs.
 Portable Programs
Portable Apps contains a list of lots of programs which are free but some commercial programs also offer portable versions of their apps and some free programs have portable versions but do not follow the portable apps format.
Some of these portable programs include:
- Atlantis Word Processor - Can be use to read files and can create ePub files.
- STDU Viewer, is free eBook viewer that reads lots of formats.
- ECub can create ePub and MOBI eBooks
U3 was a joint venture between SanDisk and M-Systems, producing a proprietary method of launching Windows applications from special USB flash drives. Flash drives adhering to the U3 specification are termed "U3 smart drives". For more information see: