usermode
Noun
Meaning
usermode (uncountable)
(computing, often attributive) A level of privilege on a system allowing users to run programs etc. safely without full access to the operating system.
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Examples
A key component of a microkernel is a good IPC system and virtual-memory-manager design that allows implementing page-fault handling and swapping in usermode servers in a safe way.
Since all services are performed by usermode programs, efficient means of communication between programs are essential, far more so than in monolithic kernels.