This mode permits selecting all features intersecting the specified polyline (that is, having common points with it). The system opens an auxiliary window “Selection polyline”.
To specify selection polyline it is necessary to move the cursor by polyline vertices clicking on every vertex. It is possible to undo incorrect creation of a vertex by performing the command Rollback from the context menu. Building a polyline is completed after a double click in the last vertex.
Additional possibilities of performing selection and deselection of features are connected with using the keys Ctrl, Alt, Shift.
The button 
of the mode toolbar in map browser window.
Modes of selecting by rectangle, circle, polyline or polygon
Using the keys Ctrl, Alt, Shift when performing selection
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