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Today many Forth implementations run under host operating systems, because the compatibility they offer the user outweighs the performance overhead. Many people who use such systems prefer using host OS files only; however, people who use both native and non-native Forths need a compatible way of accessing disk. The Block Word set includes the most common words for accessing program source and data on disk.
In order to guarantee that Standard Programs that need access to mass storage have a mechanism appropriate for both native and non-native implementations, ANS Forth requires that the Block word set be available if any mass storage facilities are provided. On non-native implementations, blocks normally reside in host OS files.
SCR is short for screen.