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Java webstart is a way to start a Java application right from your webbrowser without the need for installing. It is being used by Jenkins in order to be able to communicate with slave machines. In other words, the Jenkins master can communicate with it's slave machines via the Jenkins slaves. Those slaves in fact are Java Webstart applications. More information about Java Webstart can be found on the Oracle website.
Although installation is not required, it would be very convenient to configure your slave machines in such a way that the Java Webstart application is started after booting your slave machine. (either a separate machine which can be reached via the network or a virtual machine) Otherwise it should be started manually after each reboot by accessing the main Jenkins page and navigate to the corresponding slave node.
In order to be sure your slave machines gets connected to the Jenkins master in order to be available to execute jobs, the following steps can be followed:
Schedule a task to run the Java Webstart application and connect the Jenkins slave to the Jenkins master on startup
Once the slave machine has been setup properly and is online, it can be used by Jenkins to execute tasks. The slave machine will be visible in the Jenkins dashboard as a so-called slave-node. Several settings are available to configure this node according to your likings.
The Jenkins wiki environment already contains extensive information in how to configure and set-up your slave nodes. More information on this topic can be found on wiki.jenkins.io.