First decide if you need to select a large contiguous block of items, or individual items.
•Hold down the SHIFT key to select one block of contiguous items. You are limited to the selection of contiguous items (ie all the items must be be next to each other in the list) but the advantage is that you can easily select one item and then use one of the shortcut keys below to select a large number of items with one click. This method is better suited to the selection of a large number of items in a long list of items.
•Hold down the CTRL key to select individual items, not necessarily contiguous. This gives you the flexibility of being able to multiply select any group of items, not necessarily near each other in the list, but the downside is that each item must be selected individually (ie selecting 5 items requires 5 clicks). This method is better suited to the multiple selection of a small number of items (5-10). You can un-select a selected item by clicking on it a second time (not double-clicking).
Then, while holding down the key selected above, use the following shortcuts to extend the multiple selection (the actual effect on the selection will depend on the key selected above) :
•You can move the selection up and down by one using the UP and Down keys.
•You can move by larger increments by using the PageUp and PageDown keys.
•Using the HOME key brings you to the top of the list.
•Using the END key brings you to the end of the list.
•you can un-select a selected item by clicking on it a second time (not double-clicking)
Note that, depending on the context, not all list controls allow for multiple selection. In that case the above will not have any effect.