One file to copy.
Nothing to install, nothing to update by hand.

Almost always the Windows Firewall on the machine being connected to. Press [Register with firewall] once in its window. Then check that the IP address shown there is reachable from where you are connecting; on a VPN, use the VPN address, which is listed first.

No. It watches a folder path, not a URL. You put a new build on your own file server or NAS and each PC is told where to look, so the whole thing works on a closed network. We publish new builds on this site; distributing them inside your network is done through your own share. Packages are signed, and an unsigned one is never run.

No — the swap only happens when nobody is connected. If you want the machine you are currently connected to updated right now, the viewer has a button for it. A failed swap is rolled back to the previous build.

Yes, over a VPN. ClearRemote has no relay server, so both machines must be able to see each other on the same LAN or VPN. Port forwarding works too but is not recommended. The address field also takes a computer name, which is usually what people know.

You buy one. What arrives is a single small file, license.key. There is nothing to buy per machine.

With a company licence, put that same file on every PC in the company - the ones you connect from, the ones you connect to, however many sites. Twenty machines on the shop floor and three in the office still means one licence. A personal licence covers one named person; put it on whichever machines that person uses, at either end.

What each end unlocks (if in doubt, put it on both):

There is no online activation. Dropping the file in place is the whole of it - nothing phones home, and nothing counts machines.

Add a screen and you can. ClearRemote only asks Windows how many displays there are, so a screen made by a dummy plug or a virtual display driver is treated no differently from a physical monitor - it appears in the monitor list and gets a window of its own.

The same trick answers a harder case: a machine with no monitor at all - a rack server, a PC inside a control cabinet. With nothing plugged in, Windows comes up at a tiny resolution and the remote view is unusable. A dummy plug gives it the screen it would have had.

A dummy plug is a small part that goes into an HDMI or DisplayPort socket. A virtual display driver does the same thing in software. We do not supply, install or support either of them.

Yes. On the machine being connected to, open [このPCを公開する] and press [最高権限] (Highest) once, under Startup. Task Manager, the settings app and anything else running as administrator all become usable - and so do the UAC prompt and the lock screen. It asks for administrator consent once, and never again. Highest privilege, including the lock screen, is a Pro feature.
That one consent prompt is the exception: it is drawn on the desktop a remote session cannot see, so if you are setting this up from elsewhere, have somebody at the machine press it - or press it through another remote tool such as Chrome Remote Desktop, if one is installed. Afterwards there is nothing left that a remote session cannot reach. The easiest route is to post a USB stick: whoever is there double-clicks one icon and answers one prompt, and the machine is set up.
If you only need administrator windows and not the lock screen, choose [管理者権限] (Administrator). To register nothing at all, leave it on [一般ユーザ] (Normal user). You can switch at any time.

What happens if you leave it as a normal user. The moment a window running as administrator takes the foreground, remote control stops working entirely - not just for that window, but for every other one on the screen. Windows discards input aimed above its own privilege level and reports success while doing it, which is why it looks like the machine has frozen. Every remote control tool has this limit; ClearRemote at least says what is in the way instead of silently freezing. The UAC prompt and the lock screen are further out of reach still: Windows keeps them on a separate desktop that nothing at ordinary privilege can even see.

Ctrl+Alt+Del cannot be sent at any privilege level. Windows reserves it so that nothing can fake a sign-in prompt, and that applies to every remote control tool. Use the [タスクマネージャ] button on the viewer toolbar (Ctrl+Shift+Esc) instead.

Three choices: show one monitor, show them all squeezed into a single window, or give each monitor a window of its own on your machine. The last is what ClearRemote is for - the remote main screen lands in the main window, with the toolbar, and the rest arrive alongside.

It stays one connection while split, so dragging out of one window carries straight on into the next, and an application spanning two monitors is drawn spanning two. Close the window for a monitor you do not want and it stays closed next time; where you put each window is remembered per machine. On a single local screen you can fold it all back into one window. Per-monitor windows are a Pro feature.

The free version is for personal, non-commercial use. If you are using it for a business - your own or an employer's - a licence is required. The picture, the keyboard, file transfer and self-update are all unrestricted in the free version, so evaluate with it first and buy once you are satisfied it does the job. Per-monitor windows and lock-screen access are Pro-only, because those are the two things a company needs and a household does not.

No. It carries the screen, the keyboard, the mouse, the clipboard and files, and nothing else. Audio was left out deliberately rather than half-done.

Defects in the software, basic operation on supported Windows versions, and licence re-issue. It does not cover network, router, VPN or firewall configuration, remote hands-on assistance, or investigation of your specific environment. This is run as a one-person business; please keep that in mind.

Licences are generally non-refundable once issued, because the free version is there to try first: the picture, the keyboard and file transfer are unrestricted in it. See the refund policy.