I read the UAC page (https://www.zoho.com/assist/help/uac-support.html), and it looks like the end user - not the remote technician - has to enter the administrative password in a UAC dialogue.  Is this correct?  Any work arounds?

I support a company that does not want their end users to have administrative privileges.  I can visit their office and install Zoho client software, if that is a viable solution.  Thanks, let me know you thoughts.