Reload ? sc_change_connection

Hallo,
happy new year to all developers …

if I use sc_change_connection at the beginning on execute in a blank application, the following sql-commands refer still to old connection. What is the sense then of this makro at this position ? Is it possible to change connection immediately without reloading by manipulation special session-Variables , so that the directly following commands refer to new connection ?

Best regards
Uwe