User Awareness of a Prolog System

Help! Predicate
1

Dear All,

In Java I find these two system properties
which are usually populated:

user.home: User home directory
os.name: Operating system name
System Properties (The Java™ Tutorials > Essential Java Classes > The Platform Environment)

Is there something similar commonly used
in Prolog systems. In SWI-Prolog I only find:

   ?- current_prolog_flag(home, X).
   X = 'd:/software/logic/swipl'.

   ?- current_prolog_flag(arch, X).
   X = 'x64-win64'.

Which is not exactly the information I am looking
for. I am currently planning to introduce
a new flag:

user_dir: Result of mingling user.home,
relative to os.name.

    if (osname != null && osname.startsWith("Windows XP")) {
        file = new File(userhome, "Application Data");
    } else if (osname != null && osname.startsWith("Windows")) {
        file = new File(new File(userhome, "AppData"), "Roaming");
    } else if (osname != null && osname.startsWith("Mac OS X")) {
        file = new File(new File(userhome, "Library"), "Preferences");
    } else {
        file = new File(userhome);
    }

This directory can be used for user settings
and preferences etc… Something similar available
in SWI-Prolog?

Best Regards