sawfish workspaces

["John Lumby" <johnlumby hotmail com>]

I just became aware of the existence of workspaces after accidentally 
creating a second one.    I can't find any documentation on them.    The 
info page says this:

Workspaces
**********

  XXX what do I want to say here?

Well, what I want you to say is:

1.  what is their purpose?   what problem do they solve?   Why do they 
exist?
2.  how do I switch between them?

For 2.  I discovered two ways:
   .   in any window, click on the top-left  square, and in the pull-down, 
click on send window to, and then select either previous or next workspace
            (this was my accidental discovery)
    .   in customization of sawfish, I discovered an option for selecting 
next workspace when the mouse cursor gets close to the boundary of the 
current one.    I tried it and don't like it.
I wonder if there's some key combination I can bind to this event?

John

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