"Balloon help" is sometimes known as "[tooltips]".





Effective Tcl's example code ( http://sf.net/projects/efftcl/ )
[http://www.awl.com/cseng/titles/0-201-63474-0/efftcl-ex.tar.Z]
as well as Jeff Hobbes's widget library
[http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/tcllib/widget/library/balloonhelp.tcl]
include a balloonhelp.tcl

[[Where is its documentation?]]

[Bwidgets] have balloons under the title of "Dynamic help", here's an example how simple that can be ([RS]):
    interp alias {} help {} DynamicHelp::register
    Button .f.open -image $im(open) -command {starDOM::openFile .t}
    help .f.open balloon "Open existing XML file"

[Tix] has a ballon widget: see http://tix.sourceforge.net/man/html/TixCmd/tixBalloon.htm


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[[Also describe the section in the M&M book.]]