We're offering a new service program to our clients and need to gain access to their machines after business hours via remote access. We use TeamViewer, LogMeIn and other quite often but a user must provide us with a ID/password to gain access.
Is there a program we can install on the clients machine that runs in the background that we can ping each month, gain access and perform our service program work? Also man of our clients will not have static IP's... So we can't ping a IP/port. We're hoping a program exists, even if we have to pay for it to accomplish our goals.
We need it to work on Windows XP, Vista, 7, 8, Server 2012, 2008, 2003