This variable is for sites using the AcuServer product. It associates this copy of the ACUCOBOL-GT runtime system with a specific instance of the acuserve daemon executing on a server host machine. This variable is used only if the site is executing multiple instances of the acuserve daemon simultaneously on the same server host, and if the site wants to assign a specific runtime to a specific instance of acuserve. The default value is "1". A companion variable with the same name assigns numbers to the acuserve daemons; it is set in the server configuration file on the server host.