This article explains how to use the "at" command, which is available through the Command Prompt. "At" is used to run programs and commands at scheduled times.
Windows Command Line Guide – 1 – Introduction to the Command Prompt
The at command is available through the command prompt of many Windows operating systems, including Windows 7, Windows Vista, Windows XP, and some older versions of Windows.
This command is deprecated as of Windows 8. Microsoft recommends using the feature-rich schtasks command instead.
The availability of AT command switches may vary slightly by operating system.