Ok, maybe I stated this wrong. We are working with 5 servers: Sage 1, Sage 2, Citrix 1, Citrix 2, Citrix 3. Each Sage install would be loaded on their own Sage server. All users get load balanced between the 3 Citrix machines & could fire up either Sage instance depending on who they are. There would be multiple users on each Citrix box at one time, some using the Sage 1 install & some using the Sage 2 install. This is why SI is not liking this. Spoke to Sage about SI & they said that once the Citrix machine is licensed to one SI, another user can't license it to the other SI.
Right now we have 1 Sage install running Advanced & 1 Sage install running Standard. So, they are separate clients, each pointing to the correct install. If we move the Standard install over to Advanced, would this be an issue & would the client not be able to keep them separate? Or, will it work like the doc you attached & they would be prompted for which one they want to fire up each time?