What's the use of this block?

[kartik_old]

Can the above block be used to do this? :

How to Change the Stack_Navigator title through Blocks

Hello everyone, I have a screen named "Schedule" another is "Profiles" From Profiles screen, a message should go to Schedule screen that “Hey, show me profile of session1 speaker” - for 8 sessions. Now, schedule screen by-default has an image - the conference timeline. When it receives this message - “Hey, show me profile of session1 speaker” It should change the stack navigator title form Schedule to Profiles. How can I do this through blocks? Thanks!

Thanks!