A function designator
Arguments passed to function
is a useful way of operating on an interface owned by another process. It takes a top-level interface, a function and some arguments and queues the function to be run by that process when it next enters its event loop (for an interface owned by the current process, it calls the function immediately).
execute-with-interfaceapplies function even if interface does not have a screen representation, for example when it is destroyed. To call function only if interface has a representation, use execute-with-interface-if-alive.
execute-with-interfaceis a useful utility in other circumstances.
execute-with-interfacecalls function on the current process if interface does not have a process.
(setq a (capi:display (make-instance 'capi:interface)))
CAPI Reference Manual - 15 Dec 2011