what will does the Backup Exec do as I insert magazine ?

Hi All:

I use Backup Exec 15 on Windows 2012 R2.

Library : IBM TS3100

when I want to change a lot of tape which in the Tape library.

I would take out the magazine instead of I/O station.

After I done.

Do I need to do anything manually or what will does BE  do automatically ? 

Thank you ^.^