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With execution highlighting, you can see data values at a slower execution speed. However, you may want to monitor specific data values without needing to slow execution. You can use probes on specific wires to determine if and where unexpected data occurs. A probe displays the data from the wire both on the probe itself and also in the Probes pane when the wire executes. The data remains visible until the same wire executes again.

You can add a probe to a wire by selecting the wire and clicking Probe»Set Probe on the Debug tab.