Input and output on the logical machine level is performed via logical devices in the logical machine. These devices use DLMM I/O primitives that are completely controlled by the DLMM.
I/O requests that go beyond the local hardware boundaries are handled by the DLMM. This concept establishes full I/O transparency from the user programs' and the logical machine's view and gives full control over I/O to the DLMM. Besides disk I/O, the demonstration system DLMS386 supports only keyboards, printers and video display.