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A Call Relay is a slightly different variation of the Continuation Relay node, It can be found in the node browser under Core, and when connected to itself, or as the last node before recursion in a chain or loop of nodes it will not cause an exception.
This behaviour can be used to create loops within protoflux, but nodes such as ProtoFlux:While and ProtoFlux:For would be more suitable, as they come with built in ways of "ending" the loop that needs to be added for protoflux to be safe, and additional outputs for the start, continuation, and end of a loop.
Inputs
Input (Call)
The Call to send to the output
Outputs
Output (Continuation)
The Call continued from the Input (Call) signal.