Send Data from Second Instance to the First Instance [C#]

[Zren]

My new project consists of creating a command line alarm clock. Where the user will use Win+R or Launchy with alarm -d 1m40. This would check if there already exists an instance of the program running, and if so, it would send _____ to it.

The reason for this question is that I want a single UI to manage the alarms if multiple are created.

[Tony]

processes can communicate with each other via sockets http://en.wikipedia.org/wiki/Unix_domain_socket or by reading/writing from a shared file somewhere.