Reva GUI Library: Login/Logout

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

  _____   ___    _____  __  ______                   ______ 
 / ____| / _ \  / ____|/_ ||  ____| /\        /\    |  ____|
| |     | (_) || |      | || |__   /  \      /  \   | |__   
| |      \__, || |      | ||  __| / /\ \    / /\ \  |  __|  
| |____    / / | |____  | || |   / ____ \  / ____ \ | |____ 
 \_____|  /_/   \_____| |_||_|  /_/    \_\/_/    \_\|______|