XPlite and 2000lite use the standard Windows navigation keys.
TAB changes the focus to the next control
SPACE selects or deselects checkboxes and items in the Add/Remove options tree.
ESC When veiwing the Add/Remove Components tab opens the control menu to allow access to the controls that are located above the options tree.
Reload
Force Removal
Show All (expand tree)
Collapse All
Load Profile
Save Profile
Delete Profile
F1 Context Sensitive Help
Ctrl-P open/close the User Preferences and System Log dialogs.