From the Editor's Desk.

This issue features articles on software in the context of the history of intellectual property, the first in a two-part series on the challenge of writing contemporary history by James Cortada, an exploration of the transition from analog to digital methods in the modeling of electrical power distribution networks, an article on computing prime numbers on the ENIAC and EDSAC, and a firsthand account of the IBM Advanced Computer Systems (ACS) project of the mid-to-late 1960s by Brian Randell. [ABSTRACT FROM PUBLISHER]