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"Attach/Detach Point" is a new tool in GeoGebra 4.0.
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With this tool the user can attach a point to an object. The point becomes dependent on the object.
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The H point is a Free object at the moment (see Algebra View). It will be attached to the EF segment.
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With a click on the g segment the point H becomes dependent. It can only be moved along the EF segment.
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Title: 
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Title: 
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Frame: 29
Title: 
NumCallouts: 1
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The same tool is used to detach a dependent point. Select the tool and click on the point. 
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Title: 
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Title: 
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The point becomes a free object.
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