project.vim keyboard shortcuts

Hello friends,
I have just started using Project.vim (Have also tried nerdtree but it seems easier to add a "project" with project,+1).

But there are few problems:

1) is there any "inbuilt" way to jump between project and code's splited window?

2) Say, I already have a project
Project
|--A.c
|--B.c

Now, say, using projet.vim, I have opened A.c. fine. Again, if in project window, if i open B.c, the A.c is gone. I dont know if this is saved, or if I have any way to keep both A.c and B.c open using project.vim

Any help?

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