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[Term] Manager [Definition] 
Local software layer (not directly exposed via an endpoint) which has control of the underlying resources (GLUE). The functionalities of a manager layer which need to be accessible by remote users are typically abstracted by a middleware component via a standard interface, and are modeled by the concept of endpoint. Examples of managers are : for computing resources, batch systems such as OpenPBS or LSF; for storage resources, GPFS or HPSS. For OGSA, a manager is a software that manages manageable resources. A manager may or may not require a human operator.
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