3.6 OpenCL identifiers

There are several identifiers in OpenCL. These identifiers are the global ID, the local ID, and the work-group ID.

global IDEvery work-item has a unique global ID that identifies it within the index space.
work-group IDEach work-group has a unique work-group ID.
local IDWithin each work-group, each work-item has a unique local ID.
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