# Section 8.15:
Runtime Engine Classes

This section of the required library contains definitions of those classes which provide access to the Sather runtime engine. These are portable irrespective of culture and operating system, since they only rely on the runtime engine which provides a uniform interface across platforms.

1. Reference Classes

   1. REFERENCE - this class provides routines to convert between Sather objects and external references. It additionally provides conversions from external references to numeric 'codes'.
   2. SYS - this class provides generic features for objects of the language defined in abstract class $OB.

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