In a method of examining the surface structures of a sample or of modifying the surface structures of a sample by means of a beam impinging on the surface structure of the sample, gas is supplied discontinuously, preferably in a pulsed mode, at least in the area of impingement of the beam on the surface structure of the sample. The invention is intended to create interconnections that can be produced more cost-effectively and more effectively. These methods and systems may limit side effects of bidirectional andor less targeted stimulation. A table in a document navigable by moving a focus to scroll the document may be displayed by a UI control configured to automatically display the frozen border rows. The disturbance reducing interface may comprise a matrix of permeable material such as a mesh, foam, or other porous materials.