RDP Checker

Rob’s RDPChecker

See every computer on your domain at a glance: who’s on it, whether it’s locked, and what’s inside it. Connect or take action with a click.

Rob’s RDPChecker is a free Windows tool for school and small-business IT techs. It reads your computer list straight from Active Directory and checks each machine. It shows which computers are online and ready for Remote Desktop, who is signed in, and whether the screen is locked. You can tell which lab machines are free, find the one a teacher is using, or check before you restart a room, without walking down the hall.

What it shows

• Status: online and ready for Remote Desktop, online with RDP closed, or offline.

• Signed in and Locked?: who is using each computer right now and whether they’ve stepped away. Computers that are in use and unlocked are highlighted.

• Inventory: Windows version, patch level, date imaged, brand and model, service tag and RAM.

• C: drive space: warns in orange and red when a drive is filling up.

• Hover details: point at a computer name to see:

  • its IP address, uptime and whether a restart is pending

  • when the current user signed in

  • the last 10 people who signed in to it, newest first

What it does

• Connect with Remote Desktop Manager, Windows Remote Desktop (mstsc) or Comodo, by double-click or a button.

• Remote actions on one computer or many at once:

  • Windows Update

  • Group Policy update

  • run a script (as SYSTEM, or as you)

  • restart, cancel a restart, or shut down

• Right-click tools: copy the computer name, open its C$ share in Explorer, or rescan its inventory.

• Search: by name, user, model, service tag and more, with AND / OR, for example lab AND dell.

• Filter: hide OUs or machines you don’t care about, and show or hide columns from the View menu.

Stays current on its own

While it’s open, RDPChecker re-checks who’s online, who’s signed in and what’s locked every few minutes. It does this quietly and doesn’t move your place in the list. It also keeps inventory fresh:

• C: drive space, uptime and sign-ins: daily

• hardware and OS details: weekly

Results are cached locally, so it opens fast and still shows the last known details for computers that are turned off. A status bar at the bottom shows what it’s working on.

Requirements

• Windows 10 or 11 on a domain-joined PC

• .NET 10 Desktop Runtime (free from Microsoft)

• A domain account with administrator rights on the computers you manage. WMI and remote registry access are used for inventory.

• Optional: Remote Desktop Manager or Comodo, if you prefer those to the built-in Remote Desktop client

You can download the  latest version from the link below (you don't need administrative rights to install, but you very likely need to be signed in as an administrator to control/manage other computers)