You can use a shell at a terminal to access the system. You can install the version of pbterm for the latest touch devices to get shell access on the device. You can install utelnetd to get telnet access from your PC. You can install sshd or vsftpd to be able to copy files in and out of the device. Note that you will be able to read most of the system files, but without root access, you won't be able to write to the system directories. None of the latest devices have been rooted, as far as I know.
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