The HCS Administration Guide has a section for Starting and Stopping services. You can stop and start the services via the "Stop - HCS" and "Start - HCS" shortcuts that are automatically created on the start menu during the installation, or via the following commands:
[HCS Installation Directory]\Base64\bin\hcmds64srv /stop[HCS Installation Directory]\Base64\bin\hcmds64srv /startThere isn't a single "restart" command; though you could easily throw the commands above into a batch file.