You can run virtual APIs (virtual services) on your local computer, where you have ReadyAPI installed, or on a remote machine in your network.
From the ReadyAPI UI (see Running on Local Machine).
From your test case (by using the Virtual Service Runner test step).
From the command line by using the virtrunner.bat/.sh script.
See Running on Local Machine for an overview of all the methods.
To run a virtual service on a remote machine, you can install VirtServer on that machine, or you can save your ReadyAPI project to a WAR (Web Application aRchive) file and run this file on a servlet container like Tomcat: