Asks the interpreter to carry out the security checking needed to find out
if the calling thread can read pixels from the display screen
and returns non-zero if the operation is allowed and zero if it is not.
is closely connected to the
function that has the same name, however it does not participate in security
checks, but instead it provides an easy way for applications to run security
checks without actually carrying out an operation that might raise exceptions
that need to be caught.
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