Setting the event-mask attribute of a window overrides any previous call
for the same window but not for other clients.
Multiple clients can select for the same events on the same window
with the following restrictions:
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Multiple clients can select events on the same window because their event masks
are disjoint.
When the X server generates an event, it reports it
to all interested clients.
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Only one client at a time can select
CirculateRequest,
ConfigureRequest,
or
MapRequest
events, which are associated with
the event mask
SubstructureRedirectMask.
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Only one client at a time can select
a
ResizeRequest
event, which is associated with
the event mask
ResizeRedirectMask.
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Only one client at a time can select a
ButtonPress
event, which is associated with
the event mask
ButtonPressMask.
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The server reports the event to all interested clients.