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D20 is now equipped with a Linux Workstation (D20.ill.fr) foreseen for instrument control and in order to provide a live display of the data acquisition. You may login from everywhere inside the ILL firewall. So you may use directly the workstation on ground level behind the protection wall of D20 or you connect to it by the Tektronics X-terminal (termd20.ill.fr), the Silicon Graphics Workstation O2-R10000 (D20SGI.ill.fr, data treatment) on the platform above the instrument, by a X-terminal in the corridor of the first floor of the main-building ILL4 or in the 'computing center' in ILL19 ground-level or by a SiliconGraphics Workstation of the Diffraction Group in room 105 of ILL4 (you have to log in to the workstations first as - for instance - d20 on the commen instrument visitor account). The advantage of working directly on the workstation or on another Silicon Graphics machine are the SGI-specific OpenGL applications which do not run on simple X-terminals. This workstation is reserved for instrument control and live display and should not be used for any data treatment. So you won't obtain an own user account on it and the common instrument visitor account d20 on this machine is not identical to the common instrument user account d20 on data treatment workstations, so it is not linked to the serhom/serdon file system either.

On the workstation or any X-Terminal at the ILL/ESRF (even X-Windows emulators as eXodus - e.g., on the Macintosh G3 at D20 - or Mac-X) you log in to d20.ill.fr (the 'name' of that machine) as user 'd20' with the password 'd20d20' given by your local contact or instrument responsible. If you are not directly connected, you have possibly to work with telnet from any computer (even PC's and MAC's with telnet-software, e.g. VersaTerm) inside the ILL/ESRF firewall system (if you log in from outside you have to log in to firewall.ill.fr where you have connect to grill.ill.fr by 'c grill.ill.fr' first, after having obtained an account from the operators in ILL19). In UNIX systems or VMS you have simply to type 'telnet d20.ill.fr' in a terminal window, and you will be asked for username and password.

Now, if yo want to control the instrument, have a look at the Instrument Control program MAD!

The other workstation of D20 (d20sgi.ill.fr) is on the platform above the instrument and foreseen for data (pre)treatment. Here you may login (in similar ways as described above) on the common instrument visitor account d20 with the password d20d20 and afterwards your name will be asked and eventually a subdirectory with your name created. Due to ILL's file server system you have access to nearly any diffraction group data treatment workstation by using the instrument visitor accounts, and you will be always in the same file system of the central file server idefix in ILL19. You may obtain temporary or permanently an own user account on d20sgi which has to be discussed with the instrument responsibles. A particularity of D20 is the additional local storage of acquired data on its data treatment machine. Normally all data are regulary transfered from the instrument control machine (here d20.ill.fr) to the idefix file server where they are stocked permanently (in compressed form after two cycles and on CDROM after one year) and after some time (at the end of each cycle) erased from the instrument control workstation. Due to the important data volume created by D20, the last two cycles are stocked uncompressed and locally additionally on one of the external 4GByte-disks of d20sgi in order to have a rapid access to the data without occupying too much the internal network. If you create a large amount of secondary data from these primary numors, you are advised to store them locally as well and not via the common file system. So a local directory /home/vis/d20 has been installed for the common instrument visitor user account d20 on the second external disk of d20sgi and you may write your secondary data therein instead of the mounted disk from idefix where you have your home directory. Therefore you may want to create in your user subdirectory d20/username (to go there type cd) a link to the local d20sgi disk with ln -s /home/vis/d20/subdirectory d20sgi or so. You may go directly to that local filesystem by cd /home/vis/d20 or via the pre-installed link cd ../d20sgi (after having typed cd).

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