this software demonstration presents work of the Laser & Light Lab at the Institute of Computer Science 4 of the University of Bonn on proposed standardization work of the International Laser Display Association (ILDA). The ILDA Digital Network (IDN) Stream Specification [5] has been published in 2015 as the first of a “family” of ILDA technical standards dealing with digital transmission of laser projection/picture data over local networks. Our NetSys 2017 demonstration presents a framework for recording and replaying IDN streams in a local network. This work can be considered as a proof-of-concept implementation for gaining practical experience towards the definition of an upcoming ILDA tech standard in the “IDN family”, namely the ILDA Digital Network (IDN) File Transfer Format (IDN-File, [5]). It will describe the format for storage of IDN stream messages persistently in files and will be used by future IDN recorder(s) and player(s). The demonstration will show a prototype implementation, where the audience can see on-site live recordings of laser shows and playback of the respective IDN streams.