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Hey , whats the actual difference between the two when it comes to
1. Handling : IOCTLs are handled by the DeviceObject.DriverObject.Majorfunction[IRP_MJ_DEVICE_CONTROL] you are sending it to, what FSCTLs are handled by ?
2. IOCTLs are sent to a specific device, can one send FSCTL to a sepcific device or do they always travel the file system device stack?
3. to send a message from UM to a filter communication port you can use FilterSendMessage - under the hood it sends NtfsControlFile with specific control code and the following
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