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From User interface review document ... LMM-02: How is it handled when the user attempts to connect two operators that should not connect? The UI should inform the user the connection can't be made, and suggest what kinds of connections can be made as appropriate
We show nice highlighting which indicates which operators can not be connected.
Verified with Java CAPS 6 with NB 6.1 Patch 4 applied, and IEP *.jar and *.nbm artifacts installed from soarelease builds 20081022_1. When the connector arrow on an operator is click to start drawing a connection, red x's mark invalid matching connectors, while valid matching connectors are left as arrows.