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====== 4.2 Port ======
[[dido:public:s_cli:05_contents:01_prt:04_dll:start| Return to DidoDLL]]

===== Purpose =====
[[dido:public:s_cli:05_contents:01_prt:04_dll:port| Return to Top]]

The **DEFINE PORT** Command is to define a named [[dido:public:ra:xapend:xapend.a_glossary:p:port]] for use within a [[dido:public:ra:xapend:xapend.a_glossary:n:node | DIDO Node]] in the [[dido:public:ra:xapend:xapend.a_glossary:n:node_network]]. The Port can be used by [[dido:public:ra:xapend:xapend.a_glossary:d:dapp]] which run on the [[dido:public:ra:xapend:xapend.a_glossary:n:node|Node]].

===== Syntax =====
[[dido:public:s_cli:05_contents:01_prt:04_dll:port| Return to Top]]

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

==== Where ====
  * **PortName** ::= textual name associated with the port.
  * **ProtocolName** ::= protocol associated with the port.
  * **PortNumber** ::= [[dido:public:s_cli:05_contents:01_prt:04_dll:portnumbertype | PortNumberType]] is an integer value associated with the port. A port number uniquely identifies a network-based application on a computer. Each [[dido:public:ra:xapend:xapend.a_glossary:a:application|application/program]] is allocated a [[dido:public:ra:xapend:xapend.a_glossary:00-9:16bit]] integer port number. This number is assigned automatically by the [[dido:public:ra:xapend:xapend.a_glossary:o:os|OS]], manually by the user or is set as a default for some popular applications. 

==== Examples ====
[[dido:public:s_cli:05_contents:01_prt:04_dll:port| Return to Top]]

<code sql | Examples of Defining Port Numbers in DidoLL>
    DEFINE PORT http AS
      protocol  = TCP
      port      = 8080;
      
    DEFINE PORT Discovry AS
      protocol  = UDP
      port      = 30301;
</code>


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