Actually there are a series of WDEF-style INITs which cause a false (and
invisible) window to get layered in front of HyperCard's window. Others of
this type are Erics' WDEF, and Dave's WDEF (a color modification of Erics'
WDEF).
The symptoms are a failure to redraw the screen after displaying dialogs,
and an inability to operate with the mouse anywhere in a HyperCard window,
including clicking.
Note: The WDEF referred to above is NOT related to the common virus of
that name. The letters refer to a very common Macintosh resource for
Window DEFinition.
This article is adapted from the Claris Tech Info database.
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