Sentence:  The "<WSD>software</WSD>" comprising the carefully planned interpretive routines, compilers, and other aspects of automative programming are at least as important to the modern electronic calculator as its "hardware" of tubes, transistors, wires, tapes and the like. 
Meaning of the word marked with <WSD> tags:  Encoded computer instructions, usually modifiable (unless stored in some form of unalterable memory such as ROM).