Access to the topic you are linking to will depend on the category the topic is in, and the security settings for that category. So if you add a user to a group that has access to the category as you invite the user, then they will have access.
Access to the topic you are linking to will depend on the category the topic is in, and the security settings for that category. So if you add a user to a group that has access to the category as you invite the user, then they will have access.