Sorry, Marcelo, I wasn't very explicit. You'll need to change the source code in the MicroFour StrataFrame Security project to have 4 different sets of security user properties:
Copy over the 3 properties on the SecurityBasics class so that you can set multiple, different username/password/pk combinations for the different security users you want to have. You'll then need to change the Login.AuthenticateUser() method to check the additional security users as well.
Finally, you're code would change to this:
SecurityBasics.SecurityMaintenanceUserName1 = "sec1";
SecurityBasics.SecurityMaintenancePassword1 = "sgo1234";
SecurityBasics.SecurityMaintenanceUserPk1 = -2;
SecurityBasics.SecurityMaintenanceUserName2 = "sec2";
SecurityBasics.SecurityMaintenancePassword2 = "sgo1234";
SecurityBasics.SecurityMaintenanceUserPk2 = -3;
SecurityBasics.SecurityMaintenanceUserName3 = "sec3";
SecurityBasics.SecurityMaintenancePassword3 = "sgo1234";
SecurityBasics.SecurityMaintenanceUserPk3 = -4;