He also oversaw the development of NCSA Mosaic--the Web browser that led to Netscape Navigator--as well as the popular open-source server software known as Apache.
Today, client-server architectures have been replaced by browser-based user Web applications and the cost of computing has fallen dramatically which, along with cloud computing, have made scalability issue quite a different proposition.
Browser-based cryptography also means that anyone who breaks the SSL encryption that protects the data sent by the server could tamper with the code just as easily.