Abstract: A system for disseminating executable program files on a digital communication network, comprises: a sending workstation operable by a sender to transmit a message to an intended recipient along the digital communication network; a receiving workstation operable by a recipient to receive the message from the sender along the digital communication network; a repository of display frames, each display frame containing at least one executable program; insertion means associated with the sending workstation for inserting a command code into the message to be transmitted to the recipient by the sender; and detection means associated with the receiving workstation, the detection means being responsive to reading of the received message by the recipient to detect the command code in the received message and to load from the repository of executable program files at least one display frame corresponding to the detected command code.