Provide non-blocking function call mechanism

Function calls of ApplicationIPCManager are blocking in both direction, system-UI to app and vice versa. Please consider providing an asynchronous function call mechanism.

The characteristic of property propagation depends on the direction
system-UI to app , setter and getter: not blocking
app to system-UI: setter is not blocking, getter is blocking.

Please make the getter also non-blocking by caching results. This means only the first request blocks, the second request accesses the cached value.

A documentation should be addded which covers all cases: single process / multi process, method / property, system-ui to app and vice versa.