Why we cant have two sessions at both that refresh by itself each time adding a block?

[SteveJG]

Are you allowed to use the code server in class? (where each Project builder use the same remembered access code)

Only one of the people working on the Project can access the app stored on this server at a time.

The advice in this link might help

Multiple people programming on 1 program

This is a difficult question to answer Eric. MIT has evaluated ways to do something like this but has not yet implemented them. There are some simple ways to 'share' the code and collaborate. Here is a recent discussion Make apps with more people If the code.appinventor server (instead of the main AI server) is used to build THEProject, multiple students can access the same Project if they share the Project Entry code. This server can be used without an eMail log in; it requires a pass c…

You can store the questions and answers in Blocks in two lists. Each developer can modify these without an external file. because the questions/answers are stored in the Lists.

See Taifun's quiz example where the Q and A lists are stored in code Blocks that are editible by each coder using the Revisit Code and the code.

App Inventor Tutorials and Examples: Advanced Features | Pura Vida Apps

The http://code.appinventor.mit.edu server lets you login with a revisit code that does not require a Google sign. After you log in write down your return log in password / revisit code so you can return to your projects. Users that share the revisit code among themselves can access the app, but only one user at a time.