Reset System (21)

3270 5250 VT
Yes Yes Yes

The Reset System function reinitializes EHLLAPI to its starting state. The session parameter options are reset to their defaults. Event notification is stopped. The reserved host session is released. The host presentation space is disconnected. Keystroke intercept is disabled.

You can use the Reset System function during initialization or at program termination to reset the system to a known initial condition.