Kio usually means KDE Input or Output. This is a specific system library integrated into the KDE Software Compilation 4 or KDE Frameworks 5. It ensures file access along with access for resources and websites via one API. It may also mean key in office for the real estate sector.
As mentioned above, KIO is the KDE Input or Output library and is used for writing several kinds of applications. It can function with files which are stored on servers remotely in a similar manner as to those stored on local devices, ensuring greater network transparency. There are also libraries known as KIO slaves, which offer support/back-up for protocols at an individual level. It may also mean key in office for real estate and related sectors, as stated above.
By key in office, it means any code of authorization given to any client, customer, or allowed entity by the issuing authority, following which, the latter can use and access premises, space, and other services including information. This is the usage of the term in the mainstream real estate sector.
