Changing windows

[Scott Drellishak]

I know how to change the current window using the gl libraries.  I call
a certain routine (whose name eludes me) with the window id of the window
I want to become the current graphics window.  Suppose, however, I wanted
to allow the user to select the new graphics window with the mouse.  Is
there a function which returns the id of the window the mouse is currently
contained by (ACK! I've ended a sentence with a preposition)?

And don't tell me to RTFM.  I'm just a student, and the full manuals for
the machines (Personal Irises, by the way) are locked away in a vault
somewhere.  Thanks in advance.

Scott Drellishak, sfd at ocf.berkeley.edu