fngb__event_visible (gb_func) - Determine Event Visibility
Syntax
def fngb__event_visible(gb__event_code$,gb__event_mask$)
Description
This function determines whether an event code for a given event mask is visible. It returns 0 if an event will not be visible, or 1 if the event will be visible. If the argument is invalid or the event code is unknown, -1 is returned.