Your question is too vague. What kind of communication? Are you sending commands from one LabVIEW program to another? Are you collecting data on one that the other needs to be able to see?
You can use TCP/IP to communicate between programs (doesn't matter if they're both LabVIEW). Examples ship with LabVIEW. Doesn't matter if it's a wireless router or tin cans with a string.
You can use network shared variables to transfer data. The LabVIEW Help describes these.
Once you can formulate a better question, post back and we can provide better answer. How To Ask Questions The Smart Way
