If you have required a user to authorize his/her host PC and/or client computer, you will have to authorize the PC prior to your user being able to use that computer with GoToMyPC. Before you can authorize a computer, your user will have to convey to you (by email or phone) his/her computer’s MAC address or C: Drive serial number.
Note: Host and Client PC Authorization are not available on Macs or other PCs that require the Universal Viewer.

To
authorize a host PC or client PC:
Click the Manage PCs link in the left navigation bar.
Using the search or pagination options, search for and find the PC to authorize.
On the Manage PCs page, click the name of the host PC you wish to authorize for use with GoToMyPC Corporate or that you want to authorize Client PCs to access.
On the PC Administration page, click “Host and Client PC Authorization ID.”
On the Host and Client PC Authorization ID page, enter the user-provided MAC address or C: Drive serial number for the host PC and/or the Client PC.
Click Save Settings.
Note: MAC addresses cannot be used for authorization when the computer (Host or Client) connects to the Internet using a dial-up modem. Unlike Ethernet and wireless network adaptors, dial-up modems don't have MAC addresses. In these cases, use the C: Drive serial number for authorization.