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The DEFINE PORT Command is to define a named Port Number for use within a DIDO Node in the Node Network. The Port can be used by Distributed Application (ĐApp or DApp) which run on the Node.

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DEFINE PORT  <PortName> AS
  PROTOCOL   = <ProtocolName>
  NUMBER     = <PortNumber>;

• PortName ::= textual name associated with the port.
• ProtocolName ::= protocol associated with the port.
• PortNumber ::= integer value associated with the port. A port number uniquely identifies a network-based application on a computer. Each application/program is allocated a 16-bit integer port number. This number is assigned automatically by the OS, manually by the user or is set as a default for some popular applications.

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| Examples of Defining Port Numbers in DidoLL

    DEFINE PORT http AS
      protocol  = TCP
      port      = 8080;
 
    DEFINE PORT Discovry AS
      protocol  = UDP
      port      = 30301;