A known way of improving the quality of images derived from text-based systems is to add formatting commands or instructions to data strings. These instructions control operations of a receiver, such that the signals are processed in such a receiver, to ensure that the transmitted signals are processed in such a way as to generate a high quality video image that is capable of being displayed at a requesting client's terminal.So it looks like they defined "executable instructions" in such a way as to include things that are not actually executable instructions. D'oh.
In addition to improving the quality of displayed images, such an approach also facilitates an improvement in system compatibility. Thus, the incoming control signals are executed by a receiver's terminal in a way that is compatible with the receiving system. Thus, the output signals may be considered as executable instructions that cause operations to be performed upon the viewable data in accordance with the local constraints.
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