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Chapter 10. Handling Multiple Processes > Predefined Spawn Ids
10.10. Predefined Spawn Ids
Three variables contain spawn ids predefined by Expect. These do not correspond to actual processes, but can be logically used as if they do. They are:
user_spawn_id standard input and standard output error_spawn_id standard error tty_spawn_id controlling terminal (i.e., /dev/tty)
