Harvard Referencing Guide (not including LHS): Computer program or software

In text:

The in text citation is in the standard Author (year) format

i.e.

Adobe (2012) enables .......     or (Adobe,2012)

In your list of references:

Author (Year) Title of Program (Version, if 1.1 or above) [Computer program]. Location: Distributor (if known).

e.g.

Adobe (2012) Adobe Photoshop Lightroom (Version 4) [Computer program]. San Jose, CA: Adobe Systems Incorporated.

If downloaded from the internet

Author (Year) Title of Program (Version, if 1.1 or above) [Computer program]. Available from: [Downloaded date].
e.g.

Banjo (2011) Making Things (Version 3.1) [Computer program]. Available from: www.banjo.com/downloads/makthinv3.asp [Downloaded 3 May 2012].