During the setup, the user have the choice to configure its settings for partitionning the disks and mount some filesystem.
When you select the option to mount a file system (let says a windows one for ex) you can enter the mount point like /windows/xp.
In the field where you can enter the path, any text entered is blank, and you only know that you have entered some test by selecting it (highlight) the text in the field or saving the setting and see the result. Anyway at this step any text entered in the field for the mount point is blank and cannot be seen.