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





Effective Tcl's example code,
[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?]]

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