What is the difference between Web Express Logon, Certificate Express Logon and Reuse Active Credentials?

Web Express Logon has been available since Host On-Demand Version 8, Certificate Express Logon, formerly known as Express Logon Feature (ELF), has been available since Host On-Demand Version 5. Although the name has changed, Certificate Express Logon functions the same as ELF did in earlier versions and requires the same configuration. Reuse Active Credentials is a feature made available starting with Host On-Demand Version 10.0.

Reuse Active Credentials provides automated authentication on all emulation platforms. It is not as comprehensive as Web Express Logon but does not require any special network configuration. If a new connection is made to a host and a user has already authenticated to that host somehow, those credentials are applied to the new connection. The credentials are maintained for as long as Host On-Demand is running in the JVM. The credentials are only stored in Java memory and once the JVM closes they will have to be re-entered when Host On-Demand is restarted.

Although all three types of Express Logon allow users to log on to a host system without having to enter a user ID and password, they have different requirements for session type, client certificates, and SSL configuration. Certificate Express Logon works exclusively with 3270 session types and requires client-side certificates and an SSL connection to a TN3270 server. Web Express Logon and Reuse Active Credentials offer a wide variety of styles that function with all Host On-Demand session types (not just 3270 emulation). Certificate Express Logon requires a macro to log on to the host application and then distribute that macro to the clients. Web Express Logon and Reuse Active Credentials may or may not require a macro, depending on your environment.