Storing user settings without writing to a textfile, xml file, or registry?

[jomi]

I need to make a program that sends emails and holds email account data without using a textfile, xml file, or registry data. What kind of ways can i do this? I basically want the user to type in his email address or password, then click enter, then close the program, and then when the user opens the program, the email address is there. All without a text file, xml,ini, registry or a temp file.If that is not possible, then how about a program like the following: The user types in his email address, and clicks compile; then the program outputs another .exe that is configured to his email address. The user can then use that outputted .exe file to display his email. In other words, how would i go about outputting to a .cpp file and then using gcc functions to compile the program?