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Streams connected to the standard input, output and error file descriptors.
A stream connected to /dev/tty.
The environment variables inherited by the current process, as a keyword-indexed alist. For example, to access the DISPLAY environment variable, you could use
(cdr (assoc :display ext:*environment-list*))
Note that the case of the variable name is preserved when converting to a keyword. Therefore, you need to specify the keyword properly for variable names containing lower-case letters,