three independent programs using application server

Hi there Developing application server that will manage connections to a server. The application server will maintain one session per user. Have three or so client programs that will access the same Application server but do not need to be running at the same time. Application server is software program on server. Was thinking of creating a Windows Service on client computer to link client applications (each in separate AppDomain) via named pipe and manage single access to Application Server. Was wondering if this is good design or is there a better way?