# Announcing New CHR Tutorial (Discussion)

**URL:** <https://swi-prolog.discourse.group/t/announcing-new-chr-tutorial-discussion/3196>\
**Category:** Discussion\
**Created:** [December 21, 2019, 1:21pm UTC](https://swi-prolog.discourse.group/t/announcing-new-chr-tutorial-discussion/3196 "2019-12-21T13:21:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dtonhofer](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/dtonhofer/32/902_2.png) [@dtonhofer](https://swi-prolog.discourse.group/u/dtonhofer)\
**Post date:** [December 21, 2019, 1:21pm UTC](https://swi-prolog.discourse.group/t/announcing-new-chr-tutorial-discussion/3196/1 "2019-12-21T13:21:16Z")

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Thank you Ann. This is exactly what is needed.

Although I have Thom Frühwirth’s book, the application-level question on “how can this actually be called from Prolog” stays opaque and the SWI Prolog manual does not really help. I’m trying some coding now.

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**Author:** ![anniepoo](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/anniepoo/32/12_2.png) [@anniepoo](https://swi-prolog.discourse.group/u/anniepoo)\
**Post date:** [December 26, 2019, 6:59pm UTC](https://swi-prolog.discourse.group/t/announcing-new-chr-tutorial-discussion/3196/2 "2019-12-26T18:59:21Z")

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yes - my usual reason for writing a tutorial is “I have read the documentation, and can’t actually use this”

Please keep notes of things you find confusing.