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TIPS-080.ASC
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1992-07-16
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TIP #: 080
KEYWORDS: Windows, Screen Blanker
UPDATED: June, 1992
PROBLEM: Windows 3.1 screen blanker does not work correctly in combination
with DOS applications.
SYMPTOMS: This problem occurred on a machine that is used to run several DOS
applications under Windows. When exiting one of these applications
and returning to Program Manager, sometimes the screen wouldn't
blank. There didn't seem to be a pattern to this erratic behavior.
SOLUTION: Make sure that Program Manager is the currently selected task. If
a minimized DOS application is the current task, Windows will not
blank the screen. To make Program Manager the current task, click
on its title bar, or anywhere within its window.
I have found two ways to reproduce this problem, although there may
be more. Open two DOS applications, and switch between them
several times using [ALT-TAB]. Be certain that you are switching
directly between the two DOS applications, without accessing
Program Manager. Exit normally from one DOS application, which
should bring you back to Program Manager. A close examination of
the screen shows that the other DOS application is the current
task, not Program Manager. (Look at the Program Manager title bar,
and see that it is NOT highlighted.) Since the minimized DOS
application is the current task, Windows will not blank the screen.
This is consistent with the way I use my DOS applications under
Windows 3.1, and is the reason that this problem occurred on my
system.
Another way to reproduce this problem is to open one or more DOS
applications, and press [ALT-ESC] to switch between tasks. As you
switch between the tasks, notice that when a minimized DOS
application is highlighted, Program Manager's title bar is not.
When this occurs, Windows will not blank the screen.