Computers have become an essential part of modern life, providing services in a multiplicity of ways. Access to these services, however, comes at a price: human attention is bound and directed toward a technical artifact in a human-machine interaction setting at the expense of time and attention for other humans. This paper explores a new class of computer services that support human-human interaction and communication implicitly and transparently. Computers in the Human Interaction Loop (CHIL), require consideration of all communication modalities, multimodal integration and more robust performance. We review the technologies and several CHIL services providing human-human support. Among them, we specifically highlight advanced computer services for cross-lingual communication.