Blocks from another screen + synchronization

MIT App Inventor Help
1

Hi everyone,
And sorry for my poor english. I have two questions:

  • I'd like that my Button1 from Screen2 has action on Screen1 (filling in some Textbox). Is that even possible ?
  • I'd like that whenever I fill in something in my app on my mobile, its also synchronized with my partner mobile. I mean all of the information filled in in some Textbox should be the same between us two. Is this possible ?

Thanks
Armelle

2

For the first one, use stacked Vertical Arrangements, one visible at a time instead of Screens.

For the second see