java - communicate with another applications on the same machine

Question

Hi Stack Exchange Experts,

I am working on a task, that requires me to communicate with another applications on the same machine. the machine is a Windows 7 laptop.

There are in total 3 applications on the laptop. Their specifications are given below:

1. First application is coded in java and runs on a local Tomcat at port 6060

2. Second application is coded in java and runs on Tomcat at port 8080

3. Third application is coded in java and does not have Tomcat. It is a static web application.

Since application 1 and 2 are running on Tomcat, I have used HTTP to commicate with each other. However, since they are on the same machine, is there any ohter way for them to commincate with each other?

Application 2 needs to communicate with application 3. What is the best way for this communication.

Please let me know if you require any further information to answer my queries.

Thanks.