RecordTS Terminal Server Edition is licensed PER SERVER and is for companies running Terminal Services who would like to monitor everything their users, administrators, vendors, consultants, etc. are doing while logged into their Terminal Servers. 

RecordTS Remote Desktop Edition is licensed PER SERVER and is for companies not running Terminal Services who would like to monitor their administrators activities or anyone logging on to their machines using the via the Remote Desktop feature built into any Windows Server or Windows XP.

RecordTS Workstation Edition is licensed on a per workstation basis and is for companies running Windows XP Professional on their PCs and/or Virtual Machines (if in a VDI type solution) who would like to record all the activity performed when users connect to their workstations using the Microsoft Remote Desktop application.