1SYMPTOMS
2========
3
4When you start Windows for Workgroups version 3.11, your system may
5stop responding (hang) at the password dialog box or in Program
6Manager if you set your password to null during Setup. The WG0974 disk
7included with this Application Note contains a new virtual keyboard
8driver that corrects this problem for the following computers:
9
10   Manufacturer      | Model(s)
11-----------------------------------------------------------------------
12   Acer America      | Pac 150, 1100LX Portable
13                     |
14   Advent            | Machines using Blue Lightning chip set
15   Corporation       | 
16                     |
17   Ambra Corporation | Machines using Blue Lightning chip set,
18                     | including B466DL, B466TL, D466DL, D466TL, and
19                     | D466BL
20                     |
21   AST(R)            | Ascentia 900N 486/75 laptop
22                     |
23   Compaq            | All Aero(TM) machines, LTE Elite(TM) 4/75CX
24                     |
25   Compudyne         | Specific models unknown
26                     |
27   Crystal Data      | 486 machines
28   Systems           | 
29                     |
30   DEC(TM)           | 316 SX, 320 SX
31                     |
32   GRiD(R) Systems   | 320S with Tandy(R)/Phoenix BIOS V 1.10
33                     |
34   GTSI              | 0783 486 SX/25 (SFA and desktop)
35                     |
36   IBM(R)            | Valuepoint PS/2(R) 450TX2/D machine types
37                     | 6382, 6384, and 0783
38                     |
39   Tandy             | 2500 SX/20, 2500 SX/25, 2500 SX/33, and 4020
40                     |
41   Twinhead          | 486/33, Superset 590 386/25
42                     |
43   Victor            | 300 SX/33 and 400 SX
44
45
46   NOTE: Machines manufactured by Compaq after April 1, 1994, that
47   ship with Windows 3.1 come preinstalled with a virtual keyboard
48   driver (VKD) that corrects this problem. Upgrading to Windows for
49   Workgroups 3.11 leaves this VKD in place and allows the keyboard to
50   work properly. However, if you install Windows for Workgroups 3.11
51   to a new directory, the keyboard stops functioning. If you perform
52   such an installation, you must manually install the new VKD.
53
54CAUSE
55=====
56
57The keyboard controllers in these machines generate unnecessary
58interrupts each time a key is pressed and released. The keyboard stops
59responding because the Windows for Workgroups 3.11 VKD, unlike the
60Windows 3.1 VKD, does not ignore these extra interrupts.