when true-or-false-instruction-list instruction-list

Starts an independent parallel process that repeatedly tests whether the first instruction list reports true or false. If it reports true, the second instruction list is run. To stop a when instruction, use cancel (only on the true-or-false-instruction-list), Stop All, or press Ctrl+Break.

example

when [touching? "t1 "t2] [t2, ht]

See MW Vocabulary (in Resources) for links to other projects using this term.

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