[Newbies] UI not threaded?

[Greg Buchholz]

    I notice that the system isn't responsive when something else is running (for example, while starting up an application like SqueakMap).  Can anyone point me in the direction of a document describing Squeak's theory of operation when it comes to threads and/or the user interface?  Is Squeak a cooperative multi-tasking system, or is the UI single threaded, or...?

Thanks,

Greg Buchholz