Can anyone explain how the syslinux menus work?

[Kitty Litter]

Could someone with sight explain how these menus work? Are you required to 
select the type of install i.e. install, installgui, rescue or expert with 
the down-arrow keys and then tab and enter the other parameters? Or what 
happens if you type the whole thing from the keyboard? If you can see the 
screen it would be obvious what's going on, but if you can't, you can only 
guess. A clear explanation would be helpful!