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2.8.5. Commands and Functions for Memory
The following are commands and functions for memory:

  * Clear -- clear the working memory or a ring-bound memory
  * Defined -- check if an expression has been defined
  * Delete -- delete variables from the working memory
  * Destroy -- delete rings
  * GlobalMemory -- contents of global memory
  * Memory -- contents of local memory
  * RingEnvs -- names of all defined rings
  * Size -- the amount of memory used by an object

Details can be found by looking up each item by name.  Online, try
'?ItemName' or 'H.Syntax("ItemName")'.