Selma was Darien's link to his past (. life in our temporal future) Selma was a computer, but a computer that seemed like a real person to Darien most of the time. They fought with one another and worried about each other. By the end of the series, SELMA almost "mothered" Darien and, despite her programming, admitted a deep pride in him. By all appearances the feeling was mutual. Selma was disguised as a credit card that Darien always carried with him. Selma communicated with both a voice and a holographic interface based on a picture of Darien's mother. It is revealed that SELMA can change her outward holographic appearance if Darien so desires. Additionally, SELMA can place phone calls, perform medical and scientific testing as well as interface with virtually any computer including those belonging to law enforcement agencies. Using this ability, SELMA has created marshals' credentials. Additionally, using this ability, SELMA has also made travel reservations for Darien as well performing research from contemporary sources. SELMA also has a vast amount of information in her database; this encompasses everything from technical manuals to cookbooks and historical facts.