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# 5.5 GraphicSubgroupLattice, Selecting Vertices

Selected vertices are represented by a slightly thicker circle and, if your screen supports color, are colored red. There are five different ways to select or deselect a vertex or a bunch of vertices.

Place the pointer inside a vertex and press the left mouse button. Release the button immediately without moving the mouse. This will deselect all other vertices and select this vertex. If the vertex was already the only selected vertex it is deselected.

Place the pointer inside a vertex, hold down the SHIFT key, and press the left mouse button. Release the button immediately without moving the mouse, release the SHIFT key afterwards. If the vertex was deselected this action will select it in addition to any other selected vertices. If the vertex was already selected it will be deselected.

Place the pointer outside any vertex and press the left mouse button. Keep the button pressed and start moving the pointer. This will create a rubber band rectangle. One corner at the position where you pressed the mouse button, the opposite corner following the pointer. As soon as you release the left mouse button, all vertices inside the rectangle are selected, all vertices outside the rectangle are deselected.

Place the pointer outside any vertex, hold down the SHIFT key and press the left mouse button. Again you see a rubber band, however, now as soon as you release the mouse button, all vertices inside the rectangle are selected in addition to any other selected vertices.

To select vertices from the GAP command window call the function `SelectGroups` with a subgroup or a list of subgroups to select.

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