If you follow these steps before doing any other actions, your action will apply to all the pictures that you select. For example, you can send 3 photos by email
at the same time.
- Press and hold down left CTRL key on your keyboard.
- Click on each photos you want to select. (a blue border appears on each photos you selected).
- Release CTRL key.
- Do any other actions with Picasa, it will apply to all selected pictures.