Reset System (21)
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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.
There are no prerequisite calls for this function.
For the PC/3270, this function can be used to check whether EHLLAPI is loaded. Place a call to this function at the start of your application and check for a return code of 1.