互通

Common in business, diplomatic, and tech contexts. The set phrase 互通有无 ('exchange what one has for what one lacks') is a classic — originally from 《史记》, used today to describe trade and cooperation. In tech: 系统互通 (systems interoperate), 数据互通 (data interchange), 互联互通 (interconnection — a buzzword for infrastructure integration).

memory

互 (mutual) + 通 (connect / pass through) — 'mutually pass through'. Same 互 in 互相 (mutually), 相互 (each other), 互动 (interaction).