Owing something to the orignal meaning of the word, in computer-speak this refers to a computer process-- such as the
installation of new software-- which the installer cannot or dare not leave, because the installation is not
fully automatic and might require input from the installer during the
install.
Computer Geek 1: "Lets go grab a Starucks, want to?"
Computer Geek 2: "Can't. I'm
installing new software."
Computer Geek 1: "Oh, just let it
install itself, automatically."
Computer Geek 2: "No, this software requires some heavy babysitting."