Sony SLV-D100 Operating Instructions Manual page 69

You can store scenes in the player's memory
as bookmarks.
You can set up to three bookmarks.
NUI Press BOOKbf%i%RK during
playback.
Three bookmark placeholders C- - - ) appear
next to the bookmark icon.
to select one of the placeholders.
Play the DVD scene you want, then press
ENTER.
The selected placeholder changes to a number
(I,2or3).