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3.8.5 Commands and Functions for Memory
The following are commands and functions for memory:
Clear clear the working memory or a ring-bound memory
Delete delete variables from the working memory
Destroy delete rings
GlobalMemory contents of global memory
IsDefined check if an expression has been defined
Memory contents of local memory or ring-bound memory
RingEnvs names of all defined rings
Size the amount of memory used by an object

For details look up each item by name. Online, try ?ItemName or H.Syntax("ItemName").