In the Wizards menu, look under Developer Tools for Variables. It works for Panorama and on a server running Panorama Enterprise. For the latter, you do need to have hands on access to the server.
The Variables Wizard has a menu to select among the open databases, then you can choose to view the values of Globals, FIleGlobals and Permanent variables.
There are also a number of functions for finding them yourself. info("FileVariables"), info("GlobalVariables"), info("WindowVariables") and servervariable( thedb, thevar ). The last requires that you know the name of the database and variable to get the value of the one variable.
I'm not sure what you're referring to by "Server Variables" unless you mean the ones assigned by Enterprise itself. While you can view their values, and often enough change them, I don't know that you should delete them. Enterprise may need them and/or recreate them.
If they're variables you've created, you can use Undefine to eliminate them.