y 

n/a 

n 

Required 

_ 

_ 

_ 

4-22: 

In a collection that uses discontiguous selection and is in normal mode, all keyboard operations have the same effect as in the range selection model.  

Normal mode does not permit multiple discontiguous selections. 

Required 

_ 

_ 

_ 

4-23: 

In a collection that uses discontiguous selection and is in add mode, the Select key or Spacebar moves the anchor to the location cursor and initiates toggling. If the cursor is on an element, the selection state of that element is toggled, but the selection state of all other elements remains unchanged. Shift+Select or Shift+Spacebar and shifted navigation operations extend the selection between the anchor and the location cursor, based on the toggle mechanism used by Control+BSelect (Anchor Toggle or Full Toggle).  

Add mode permits use of the keyboard to make multiple discontiguous selections.