Most B2 software does not use the registry for anything vital, and never uses anything outside of its installed directory.  In theory this should classify it as portable, but we do not test it for such.  If you would like to test this yourself, please do so, but bear in mind that some programs will need to create and edit data and settings files, so burning the software to a cd is not advisable.  Transferring the software to a USB stick or drive should be workable though (the drive letter is not hard-coded into the software).

Registered software is different - while theoretically it should also be portable, the registration data is dependant on the hardware configuration of the pc it was registered on.  So, moving it to another directory on the same pc may be ok but it will NOT work if moved to another pc.