I recommend you to go through the Online Course "Getting Started with Caché". The link is:
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$HOROLOG is one of the "Caché ObjectScript Special Variables". You can find more details in the link:
http://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=...
The documentation about Caché ObjectScript Commands, Functions and Special Variables can be found in the link:
http://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=...