Global and session system variables are related as follows: System variable values can be set globally at server startup by using options on the command line or in an option file.
When you use a startup option to set a variable that takes a numeric value, the value can be given with a suffix of The preceding modifiers apply only to system variables.
The path to the Programs folder in the user's Start menu.
On Windows NT/2000/XP, this is the path from the All Users profile.
The path to the user's DAO (Data Access Objects) directory. On Windows NT/2000/XP, this is the path from the per-user profile. On Windows NT/2000/XP, this is the path from the All Users profile. The user's personal (My Documents) folder on their system.
At run time, you can create and manipulate session variables using the available Session Var actions.
If a session variable used on a screen needs to be set to a different value, it must be set prior to the screen's displaying, and all of its events.
If you change a session system variable, the value remains in effect within your session until you change the variable to a different value or the session ends. If you change a global system variable, the value is remembered and used for new sessions until you change the variable to a different value or the server exits.
The change is visible to any client that accesses the global variable.