N/runtime Module
Session.set()
Method Description: Sets a key and value for a user-defined session object. Use Session.get(options) to retrieve the object value after you set it.
Returns: void
Supported Script Types: Server scripts For more information, see SuiteScript 2.0 Script Types.
Governance: None
Module: N/runtime Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Session.set(options)

// Code Example 1

// Add additional code

//...

var sessionObj = runtime.getCurrentSession();

sessionObj.set({

    name: 'myKey',

    value: 'myValue'

});

log.debug('Session object myKey value: ' + sessionObj.get({name: 'myKey'});

//...

// Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4296667139.html