Reva GUI Library: Login/Logout

Visitors may enter anonymous as the user-ID with the 8-character hexadecimal password shown below:

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|  ____||  __ \  / _ \  / _ \ |__ \  / ____| / _ \  / _ \ 
| |__   | |  | || (_) || | | |   ) || |     | (_) || (_) |
|  __|  | |  | | > _ < | | | |  / / | |      > _ <  > _ < 
| |____ | |__| || (_) || |_| | / /_ | |____ | (_) || (_) |
|______||_____/  \___/  \___/ |____| \_____| \___/  \___/