http://www.strw.leidenuniv.nl/local/computers.php
The observatory makes use of PCs connected through a Linux network. The information on the computer network changes rather frequently, so for details we refer to the Leiden web pages (see above). Make sure that you are on the observatory e-mail list. E-mail aliases are handled at system level, so if you are not on this list you may miss some of the announcements (such as for colloquia).