The current CSIL lab schedule is always available here . The facilities page has additional details.
All UIUC students receive a students.uiuc.edu account.
All Engineering college students receive an EWS account. Only students currently enrolled in CS courses that are using the CSIL facilities receive CSIL accounts. The labsitters are responsible for keeping the labs clean, reporting problems and answering very basic questions. They can also assist with changing passwords and fixing hung systems.