Demo of the SREF_VALUE function

• * means : show all variables
• ** is used when requesting OS/2 variables; it causes all variables to be displayed, even INItialization variables.
• Technical note: INItialization variables are saved in the OS/2 environment, using a special prefix. This prefix depends on several factors (the vintage of the variables, the port number you are running SRE-http under, etc); but always begins with SRE, and always has a "_" before the INItialization variables name.
• To specify a host-specific INItialization parameter, either append a .HOST_NICKNAME to the variable, or add the host nickname after the variable (preceded by at least one space).
• REQuest specific variables are specific to a request. These expire after a short time (by default, after 150 requests have arrived).

  The request number is only used to look up REQuest specific
  information for other requests. If you do not specify a request number, and you ask for a REQuest specific variable, the variables for the current request (actually, for the request that results when you submit the form) will be used.

• USEr variables are global to all requests, and to all SRE-http daemons. They do not expire, but they must be explicitily created (say, by an SRE-http addon that calls SREF_VALUE).