The RPG manager program is responsible for unpacking entry parameters from request string, then call black box program. The result from black box porgram is packed back into response. The manager program handle also errors and warnings, it means retrieve them from memory and put into JSON string in correct format. Aperio provides set of tools to help programmer to operate on request/response without any pain. Complete list of tools are described in this documentation. The procedures are divided into groups: Request procedures which can be used to operate on JSON request. Response procedures which can be used to pack results back into JSON response. And other procedures which are uncategorized.