Abstract: A communication link information generating device for generating link information for communications in a three-tier system in which a general-purpose computer, which operates in a non-distributed object environment, is applied to a distributed object environment. In the communication link information generating device, an input device reads an application definition set in which communication information for three tiers is collectively defined, and an analyzer analyzes the application definition set. Based on the application definition set, an interface definition language (IDL) source creating device creates an interface definition language source for a client/server system, a source code generating device generates a source code of an application of a server system serving as a gateway, and an interface information file generating device generates an interface information file for a server application of the general-purpose computer, whereby linkage of different environments is achieved.

Abstract: In a method for controlling communication paths multiplexed in a communication medium connecting first and second communication devices, each of which devices can simultaneously perform a plurality of works. It is determined whether a communication request from one of the works is a normal communication request or an emergency communication request. It is determined whether or not the number of communication paths which are now in use is less than a first predetermined number when it is determined that the communication request is a normal communication request. An idle communication path is allotted to the communication request when it is determined that the number of communication paths in use is less than the first predetermined number. It is determined whether or not the number of communication paths which are now in use is less than a second predetermined number greater than the first predetermined number and equal to a maximum number of communication paths available in the communication medium.