Abstract: In order to use dynamic data types in user programs when transmitting information over a computer network using the OSF distributed computing environment, where dynamic data types are not provided for, the control instruction "transmit.sub.-- as" or "represent.sub.-- as" provided in DCE is added as an attribute to the data type defined by the user. When the control instruction is compiled, a call to a conversion program is thus inserted into the interface procedure (stub). Every time the dynamic data type occurs in the user program, the conversion program is called by means of the interface procedure, the dynamic data type is converted there into a defined data type available in program execution and capable of being processed by the interface, and is then transmitted via the interface to the network.