Site managers who work in highly-sensitive campus units may not be able to connect via Git, SSH, drush, or SFTP to outside services due to security restrictions. Pantheon is unable to provide fixed IP addresses, so it is not possible to add firewall exceptions for individual sites.
Other site managers may not be able to install the required software clients on their computers.
In either case, you can still accomplish the most common development tasks using the Pantheon dashboard and the Drupal site interface in your browser....