struct hwUserTagList *clone = hw_CloneUserTagList(struct hwUserTagList *usertags, struct hwTagList *tags);
usertagsand returns the cloned copy. The cloned user tag list must be freed using the hw_FreeUserTagList() function. See hw_FreeUserTagList for details.
User tags are a way of passing additional data to plugins and are supported by many plugins. See User tags for details.