A model proposed by Iacoboni et al. suggests split-brained patients experience asynchronous activity which results in a stronger signal and thus a decreased reaction time.

(The concept that has yet to be adopted is that the synchronous marshalling point of all the asynchronous activity itself could be asynchronous, ad infinitum.

For collaboration support TUIs have to allow the spatial distribution, asynchronous activities, and the dynamic modification of the TUI infrastructure, to name the most prominent ones.

When the worker process needs to execute I/O or other asynchronous activity, it initiates the action, marks what it is waiting for, and calls the context-switching function, which selects a different context for execution.