| Sel all | 
Selects all objects that are not hidden.
If sub-objects are selected, the selection will be limited to other sub-objects. For example, if you have an edge of a solid selected, this will select all edges of that solid and not other objects.
| Desel all | 
Deselects all objects
You can also use the Esc key to deselect objects, see Shortcut keys for more information.
| Invert | 
Inverts the selection - selected objects will become unselected and unselected objects will become selected.
If sub-objects are selected, the changes will be limited to other sub-objects. For example, if you have an edge selected, this will invert the selection of all edges of that solid and not other objects.
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