Many of VSS's most common commands such as Get Latest Version, Check Out, and Check In can work on more than one file at once. For them to do so, however, you must select multiple items before choosing the menu command you want to execute.
To select multiple items with the Select dialog box:
VSS displays the Select dialog box.
Click Select or press ALT+S.
To select items with the mouse:
Or
Hold down the CTRL key as you choose each item you want; to select a block of items, click the first item, hold down the SHIFT key, and click the last item.
To select items with the keyboard:
To deselect items with the Invert Selection command: