Dell Inpsiron 560 (Late 2009) - Manual (Page 111)

Files and Folders
111
Selecting and Opening Files
To open a file, you first need to select the file. To select a file, click the
filename one time. Selected files appear highlighted. To open the file, double-
click the selected filename.
Selecting a Group of Files
Click the first file you want included in the group. Press and hold down the
key as you click the last file to include in the group. All the files in
the group are highlighted.
Selecting Several Random Files
Click a file you want to select. Press and hold down the key as you
click each file. All the files you selected are highlighted.
SHIFT
CTRL