Select one object by clicking it in the interface or in the Module Browser.
Select a number of adjacent objects by positioning the mouse cursor above and to the left of the objects, pressing mouse button 1, and dragging the mouse to encompass other objects down and to the right of the first object.
Add or subtract an object to the current selection by clicking mouse button 2 on the object.
If an object is selected, clicking mouse button 2 on it deselects it.
To add a number of adjacent objects to those that are selected, position the mouse cursor above and to the left of the objects to be added, press mouse button 2, and drag the mouse to encompass other objects down and to the right of the first object.
Only that object will be selected.
When you have selected a number of objects in the interface, all the objects will move if you press mouse button 1 on one of the objects and move the mouse. A rectangular border will be drawn around the objects as you move the mouse.