The invention relates to local area networks including Ethernet networks which typically comprises a LAN hub, a plurality of outer hub devices connected to the LAN hub via a respective plurality of LAN links and a plurality of USB devices andor LAN computers connected to the plurality of outer hub devices via a respective plurality of USB links. Compounds having a zinc-binding moiety, for example, an alpha-ketoepoxide group, such as an alpha-ketothio group, can inhibit histone deacetylase. Verification of the optimized preliminary mask layout includes operating a verification simulator using the sample data and the optimized preliminary mask layout as input data to obtain verification image data. Each path includes multiple network links such that a single network link may be shared across multiple paths. Also disclosed are laser workstations having two lasers driven by a single electronics drive system in which a single energy storage network is connected to a first laser pump chamber operative to excite a first laser medium and connected to a second laser pump chamber operative to excite a second laser medium. The circuit tester apparatuses may have two or three pairs of tester lead wires for connection to the electrical circuit.