I would also suggest TeamViewer, there is a free version and a commercial one that you can rebrand with your logo to redistribute to your clients. It does require (non administrative) install but works also behind firewalls.
Your client needs only download a small file from your helpdesk and run it. Then your helpdesk can control the client's desktop. The small file will uninstall itself after closing the session. The requirement is your UltraVNC should be run in listen mode.
Definitely TeamViewer! Especially because it's very easy for the 'other side'. No complicated skills required. Just install and run it. Easy to explain over the phone while immediatly asking for their 'code'.
SSH 也是一个选项，通过 OpenSSH，您可以在 Windows 上使用它（使用 cygwin），但这并不总是合适。
最后，我认为 VNC 可能是您最好的选择。
I personally feel that UltraVNC is the best support tool for Windows boxes, especially since the end user can see what you're doing as you're doing it. Very good for training purposes as well.
RDP is neat, but I find it very frusting to use, unless on high-bandwidth or bandwidth stable machines. Port forwarding can also be a pain if the routing hardware is not great at the end users endpoint. You also need to worry about user permissions and enabling RDP as well, which if you need to do in 3rd person, can be tricky.
UltraVNC (like the other VNC clients) has a cool "Listening Host" which allows you to still VNC into a VNC server if the server's endpoint is not a direct connection to the net. This can be very useful. I've worked in the financial services sector, and we use VNC in this capacity and have never had any issue both installing it enmasse and have never had a security breach.
SSH is also an option, and with OpenSSH you can use it on windows (using cygwin) but this isn't always suitable.
In the end, I think VNC is possibly your best bet.
I use logmein.com quite a bit which works very well but it does have a full client installation. However it is available at any point and once installed does not require user to allow remote connection (which may or may not be ok with your customers).
Given your requirements, I think CoPilot is probably your only option, although you will require client interaction - they need to download and run an executable, but its very straightforward.
RDP - 非常适合 Windows 计算机，但当不清楚是否必须使用控制台会话时可能会出现问题。 有时，您会意外地断开服务器会话。
I have had good experience with the remote control of NTRSupport. Quite easy to use with no installation required.
I also used and/or use the following software that does not cover all your requirements:
Timbuktu Pro - Bad performance, few features, can't recommend it nowadays.
UltraVNC - Works, but I remember some problems with clipboard and file transfer support.
PCAnywhere - Works, but the performance was never satisfying, Awkward clipboard handling.
RDP - Great for Windows machines but can be problematic when it is not clear whether you have to use the console session or not. Sometimes, you disconnect a server session just by accident.
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我还建议 TeamViewer，有一个免费版本和一个商业版本，您可以使用您的徽标重新命名以重新分发给您的客户。 它确实需要（非管理）安装，但也可以在防火墙后面工作。
I would also suggest TeamViewer, there is a free version and a commercial one that you can rebrand with your logo to redistribute to your clients. It does require (non administrative) install but works also behind firewalls.
副驾驶
Copilot
我们使用UltraVnc SC（单击），请参见此处：
http://www.uvnc.com/addons/singleclick.html
您的客户需求只需从帮助台下载一个小文件并运行它。 然后您的帮助台就可以控制客户的桌面。 关闭会话后，小文件将自行卸载。 要求是您的 UltraVNC 应在侦听模式下运行。
We use UltraVnc SC (Single Click), see here:
http://www.uvnc.com/addons/singleclick.html
Your client needs only download a small file from your helpdesk and run it. Then your helpdesk can control the client's desktop. The small file will uninstall itself after closing the session. The requirement is your UltraVNC should be run in listen mode.
绝对是TeamViewer！
特别是因为这对“另一方”来说非常容易。
不需要复杂的技能。 只需安装并运行它。 很容易通过电话进行解释，同时立即询问他们的“代码”。
Definitely TeamViewer!
Especially because it's very easy for the 'other side'.
No complicated skills required. Just install and run it. Easy to explain over the phone while immediatly asking for their 'code'.
尝试
CoPilot。Try
CoPilot.TeamViewer 到目前为止对我帮助很大，但它仅适用于 Windows 和 Mac。 遗憾的是没有 Linux 支持。
TeamViewer has been a great help to me so far but it's only available on Windows and Mac. No Linux support unfortunately.
我个人认为 UltraVNC 是 Windows 机器的最佳支持工具，特别是因为最终用户可以看到您正在做的事情。 也非常适合培训目的。
RDP 很简洁，但我发现它使用起来非常令人沮丧，除非在高带宽或带宽稳定的机器上。 如果最终用户端点的路由硬件不是很好，端口转发也可能会很痛苦。 您还需要担心用户权限并启用 RDP，如果您需要以第三人称身份进行操作，这可能会很棘手。
UltraVNC（与其他 VNC 客户端一样）有一个很酷的“监听主机”，如果服务器的端点没有直接连接到网络，它允许您仍然通过 VNC 连接到 VNC 服务器。 这非常有用。 我曾在金融服务行业工作过，我们使用 VNC 来实现这一目的，并且在大规模安装时从未遇到过任何问题，也从未出现过安全漏洞。
SSH 也是一个选项，通过 OpenSSH，您可以在 Windows 上使用它（使用 cygwin），但这并不总是合适。
最后，我认为 VNC 可能是您最好的选择。
I personally feel that UltraVNC is the best support tool for Windows boxes, especially since the end user can see what you're doing as you're doing it. Very good for training purposes as well.
RDP is neat, but I find it very frusting to use, unless on high-bandwidth or bandwidth stable machines. Port forwarding can also be a pain if the routing hardware is not great at the end users endpoint. You also need to worry about user permissions and enabling RDP as well, which if you need to do in 3rd person, can be tricky.
UltraVNC (like the other VNC clients) has a cool "Listening Host" which allows you to still VNC into a VNC server if the server's endpoint is not a direct connection to the net. This can be very useful. I've worked in the financial services sector, and we use VNC in this capacity and have never had any issue both installing it enmasse and have never had a security breach.
SSH is also an option, and with OpenSSH you can use it on windows (using cygwin) but this isn't always suitable.
In the end, I think VNC is possibly your best bet.
我在 CrossLoop 方面获得了非常好的体验。 它是免费的，您可以在 2 分钟内建立连接。
I've had very good experiences with CrossLoop. It's free and allows you to setup a connection within 2 minutes.
我经常使用 logmein.com，它运行得很好，但它确实有完整的客户端安装。 但是，它随时可用，并且安装后不需要用户允许远程连接（这对于您的客户来说可能会也可能不会）。
考虑到您的要求，我认为 CoPilot 可能是您唯一的选择，尽管您需要客户端交互 - 他们需要下载并运行可执行文件，但它非常简单。
I use logmein.com quite a bit which works very well but it does have a full client installation. However it is available at any point and once installed does not require user to allow remote connection (which may or may not be ok with your customers).
Given your requirements, I think CoPilot is probably your only option, although you will require client interaction - they need to download and run an executable, but its very straightforward.
我对 NTRSupport 的远程控制有很好的经验。 非常易于使用，无需安装。
我还使用和/或正在使用以下软件，但不能满足您的所有要求：
I have had good experience with the remote control of NTRSupport. Quite easy to use with no installation required.
I also used and/or use the following software that does not cover all your requirements:
仅适用于 Windows：Crossloop
For windows only: Crossloop