Registration at CERN:

on the Users Office pages at CERN: http://ph-dep-usersoffice.web.cern.ch/ph-dep-UsersOffice/
fill in the forms:

1. Registration form:
   http://ph-dep-usersoffice.web.cern.ch/ph-dep-UsersOffice/CheckIn/RformEN.pdf
2. Home Institution Declaration:
   http://ph-dep-usersoffice.web.cern.ch/ph-dep-UsersOffice/CheckIn/HomeInstitutionDeclarationforUO.pdf

Pre-registration for new users: before actually travelling to CERN, it is possible to pre-register, which saves bureaucracy at CERN. For this, the online tool is used:
http://usersoffice.web.cern.ch/pre-registration-tool

Extension of registration:

1. fill in via EDH
2. Provide an attachment with the so-called Home Institution Declaration

Then it is necessary to register according to the experiment at the respective secretariat

• ATLAS (team leader Tomáš Davídek, representatives Rupert Leitner, Zdeněk Doležal)
  https://atlas-secretariat.web.cern.ch/registration?check_logged_in=1
  where the first described step is logging in to CERN.
• NA62 (team leader Karol Kamf)
  http://na62.web.cern.ch/na62/Collaboration/NA62Secretariat.html

Finally, it is necessary to

1. Create an account for CERN computers, access to EDH, and set up an authorisation password
2. Modify your account online: http://www.cern.ch/account
3. Complete safety training as required by the individual experiments