The Information and Computer Science building (ICS), previously named the Computer Science building, is the primary facility for undergraduate instruction, consisting on 4 floors, opposite to the Engineering Tower (ET). The bottom (and first) floor links physically to ET's bottom floor, while the second floor shares the same plaza with the ET. The bottom floor consists of three instructional labs, CS183, CS189, and CS192—each lab contains 45 Microsoft Windows Server machines, used primarily as desktops for first year undergraduates. Lab CS193 is used for business related software projects for upper division undergraduates, and holds 24 Windows machines. Both the first and second floors contain instruction halls and classrooms, while the third and fourth primarily contain meeting and faculty offices, except for CS364.