Purchase
The Demo Version of ESP gets you two banks and eight hot keys per bank. All macros are available to customize the hot keys, so you can fully explore the playback functions. You can save your settings, but are restricted to a set file.
ESP is an annual subscription that gets you three seats. This allows you to install on a primary and secondary PC for large events where you want a backup playback PC running in tandem. The third seat is for a travel PC(laptop) that moves easily for smaller shows. There are IP restrictions that keep you from using the same license at multiple locations at the same time.
Use
It is not necessary to constantly be online to use ESP, you will be required to verify your login on occasion. The maximum amount of offline activity is 14 days. After that you will need to re-verify your subscription status.