The task object corresponding to the Cascade Historian. See locate_task in the Gamma manual.
A string containing the version if successful, as:
(version "vm.vn build number">
where "m" is the major version number and "n" is the minor version number. Otherwise returns nil and sets _last_error_ to the error string returned by the Cascade Historian.
This function is similar to using the -V option on the histdb command line at the shell prompt, but it lets you check the version number while the Cascade Historian is running.
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