How to Use mst RealDelete to Permanently Remove Files

I can’t find authoritative public information for a tool named exactly “mst RealDelete.” Possibly it’s a niche/internal option or a misspelling (examples: “sdelete”, “realdelete” setting in some configs). Provide one of the following and I’ll proceed:

• Confirm you meant “mst RealDelete” (I’ll assume it’s a specific product and draft a complete guide from general secure-delete best practices), or
• Tell me the exact product link or a short description (platform, vendor), or
• Confirm you meant “sdelete” or “realdelete” in an app (I’ll write the guide for that).