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Tests from a plugin monitor are executed at the specified interval by the DGE. In contrast, the DGE does not perform any tasks for EDF tests. The DGE expects to receive test results from an external data source (script, application) at specific intervals via a TCP socket. The connecting application will need to following the EDF API protocol to communicate with the DGE. The EDF monitor is useful when the metric to be monitored is on a different host that is not accessible from the DGE via standard (SNMP, WMI) or proprietary (IP based) methods. The EDF API is also scalable to a larger extent compared to plugin monitors since the remote host can insert results for multiple tests over a single TCP session.