I would like to know if like in other applications as "signal" , is possible to login into the iTunes partition , then go to the login window without doing logout , and continue using Remote Buddy at least just to manage iTunes.

In this way you can protect the computers against aliens like children and others while listen to the music.

Thanks

Mary Kay 

Remote Buddy will deactivate all remote controls on a fast user 
switch, so that the user you switch to can use the same (hardware and 
internet port) resources seamlessly. Since the AJAX Remote is a remote 
control in Remote Buddy, it will be deactivated, too, when switching 
to another user.

If all you are looking for is protecting your Mac from usage through 
your children, you can achieve this is another way:

1) Go to System Preferences > Security > General

2) Activate "Ask for password when ending sleep or screen 
saver" (wording may be different)

Best regards, 
Felix Schwarz