||Inspects a directory and compares whether any files' "last modified dates"
have changed since the last time it was inspected.
||Inspects a file and compares whether it's "last modified date" has changed
since the last time it was inspected.
|| Built in job for executing native executables in a separate process.
An implementation of Job, that does absolutely nothing - useful for system
which only wish to use
, rather than writing
Jobs that perform work.