Radmin Viewer works by itself. You dont really need to install it. Copy the EXE stright from the Frogram Files\Radmin Folder Keep a copy of the EXE on a shared folder or carry it around in your USB key.
The only problem is that the phonebook is stored on the local computer, so each time you use a computer for the first time you would have to set the server's address. I find this as a good thing if someone "stumbles" on it, they wont know the server's address. so they don't just have to crack one password
I keep a copy on my webserver and when in the the need I just ***** in the address and since its only 430kb zipped... no sweat. I have it in seconds!