Exchange information with other programs

Using programs such as IFTTT or other apps created with App Inventor, how can we exchange information between them?
For example, if you had first app that receives information from outside (via sms or via tcp / udp) and were to send it to a second app for viewing, how do you do it?

You possibly could use Using the Activity Starter to pass information from one app to another. Read the section Passing values between applications

here is an example
Trigger IFTTT to send an email using App Inventor without user interaction


Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.

Very helpful
thank you

Very interesting article
I will definitely try
Thank you