In great demand are efficient mechanisms for delivery of evidence-based interventions for promoting social-emotional development and early positive behavior of all children, and especially for those with or at risk for disabilities. The rise of Internet use has created potentially new avenues for intervention delivery, which, when paired with the many recent advances in computer networking and multimedia technology, is fueling this demand. This article describes the development of an Internet-based, computer-delivered parent-training intervention, Infant Net, with infants at risk for poor social-emotional outcomes. Results of a randomized control trial of the Infant Net intervention with 40 parent-infant dyads showed significant increase, reflecting a medium to large effect size, in infant social engagement and engagement with the environment for infants in the intervention group as compared to the control group. Implications are discussed with regard to future research. (Contains 1 table and 8 figures.)