E-Laboratories are important components of modern e-learning environments, specially in scientific and technical disciplines. Out of E-Laboratories, Remote Laboratories enable learners to train on remote real systems. Such systems are generally used by only one learner at a time but they would gain by being shared between several learners during a same lab. session. This paper presents solutions and their constraints to do so, by making an analogy with industrial production problems. Three system access scheduling algorithms are proposed and simulated on a remote lab. scenario.