update op mode docs

docs/content/reference/sdk-operating-modes.md

@@ -75,6 +75,18 @@ Use [`rr.save`](https://ref.rerun.io/docs/python/stable/common/initialization_fu
 #### Rust
 Use [`RecordingStream::save`](https://docs.rs/rerun/latest/rerun/struct.RecordingStream.html#method.save).
 
+
+## Standard Input/Ouput
+
+Streams all logging data to standard output, which can then be loaded by the Rerun Viewer by streaming it from standard input.
+
+#### Rust
+
+Use [`RecordingStream::stdout`](https://docs.rs/rerun/latest/rerun/struct.RecordingStream.html#method.stdout?speculative-link).
+
+Check out our [dedicated example](https://github.com/rerun-io/rerun/tree/latest/examples/rust/stdio/src/main.rs?speculative-link).
+
+
 ## Adding the standard flags to your programs
 
 We provide helpers for both Python & Rust to effortlessly add and properly handle all of these flags in your programs.