SSIS-668 refers to a specific development ticket/issue identifier; without a project context it most often denotes a task in a software integration or issue-tracking system (e.g., JIRA, GitHub Issues, or an organization's internal tracker). Below is a concise, structured exploration you can adapt to the actual context where SSIS-668 exists.
Example:
dtexec /F "PackageName.dtsx" /CHECKPOINT FILE "C:\Temp\Checkpoint.xml"