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* System variables are used to alter the behaviour of the language. For example the number of significant digits displayed can be controlled by setting the [[print precision]] (<source lang=apl inline>⎕PP</source>). | * System variables are used to alter the behaviour of the language. For example the number of significant digits displayed can be controlled by setting the [[print precision]] (<source lang=apl inline>⎕PP</source>). | ||
* System objects are references to namespaces, in particular the session object (<source lang=apl inline>⎕SE</source>). | * System objects are references to namespaces, in particular the session object (<source lang=apl inline>⎕SE</source>). | ||
* System functions are various utility functions, like | * System functions are various utility functions, like <source lang=apl inline>⎕FX</source> to define ("FiX") a function under program control. | ||
* System operators only occur in [[Dyalog APL]] and are used for things like text search and replace (<source lang=apl inline>⎕S</source> and <source lang=apl inline>⎕R</source>). | * System operators only occur in [[Dyalog APL]] and are used for things like text search and replace (<source lang=apl inline>⎕S</source> and <source lang=apl inline>⎕R</source>). | ||