Man in the middle attacks
It is my understanding that when using Zoho Meeting, that the connection goes through your servers.
Some remote-control software offers no protection from man-in-the-middle attacks. But other software does protect against such attacks. One commonly used technique is end-to-end encryption. When all the data flowing between two PCs is well encrypted, a hostile server in between — a man in the middle — sees only a stream of useless gibberish.
TeamViewer, offers end-to-end encryption so does LogMeIn Free remote-access software and so do others.
Does yours?
There are other security techniques, too, such as SSH and VPN tunneling.
It is my understanding that the better remote-access software uses these tools together to make connections very secure.