* The {{Parameter|memBlock}} variable name must have been created using [[DIM]] memBlock [[AS]] [[_MEM]] type ([[DIM]].
* The function verifies that the memory variable exists in memory before using a passed block, to avoid generating QB64 errors.
* Typically, this function is used by a [[DECLARE LIBRARY|LIBRARY]] [[SUB]] or [[FUNCTION]] which accepts a [[_MEM]] structure as input, to avoid an error.