Sentence:  A <WSD>hacker</WSD> starts with nothing but a dream and a floppy disk and presently finds himself in a business that's doubled and trebled. Three "diskzines" — magazines on floppy disks — started cheaply by entrepreneurs who placed ads in obscure computer journals ... 
Meaning of the word marked with <WSD> tags:  One who is expert at programming and solving problems with a computer.