xz is a lossless data compression program and file format which incorporates the LZMA/LZMA2 compression algorithms. One can think of xz as a stripped-down version of the 7-Zip program. xz has its own file format rather than the .7z format used by 7-Zip (which lacks support for Unix-like file system metadata).
In general, an ePortfolio is a purposeful collection of information and digital artifacts that demonstrates development or evidences learning outcomes, skills or competencies.
The teleporter is used to travel to and from a ship. You will appear on top of the teleporter when returning to your ship or when teleporting to another player's ship. You also have the option to warp to your home planet, if you set one earlier.