File session handles obtained via [[FS:OpenFile]] and [[FS:OpenFileDirectly]] can be used to access files through a service-like interface, despite not being an actual service registered using [[SRV:RegisterService]]. To use this service-like interface, simply call SendSyncRequest with a file session handle, using the IPC buffer in thread-local storage, just like you would with a proper service.
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File session handles obtained via [[FS:OpenFile]] and [[FS:OpenFileDirectly]] can be used to access files through a service-like interface, despite not being an actual service registered using [[SRV:RegisterService]]. To use this service-like interface, simply call the SendSyncRequest SVC with a file session handle, using the IPC buffer in thread-local storage for parameters and responses, just like you would with a proper service.