When prompted to authenticate the default box has a label like "Pipeline Pilot" or 
"Web Port
Welcome to Web Port, your online resource for running Pipeline Pilot protocols in a Web browser. Enter your user name and password, and then click Sign In."

In the "old days" there was a Javascript SDK where this could be customized to rebrand the logon screen so you could substitute "My Cool Company-specific Project Name" for this text but I do not see how to do that in modern versions (I am using PP 23.1).  The online help suggests using the Restful Services instead of the Javascript SDK for other functionality, but I do not see a mechanism for setting up custom string in the logon dialog for users who are accessing a specific protocol or package of protocols.
 

My workflow is that end-users who access the project launch URL via link like https://servername:port/protocols/MyProject/MyEntryProtocol?\\\$streamdata=*

We want a way to indicate to them when they authenticate that the protocol they are launching is part of "MyProject"