user32: Implement a bit BroadcastSystemMessage, try 3

Maarten Lankhorst m.b.lankhorst at
Mon Mar 10 20:38:25 CDT 2008

Security isn't implemented yet, but as long as you can send messages
to other windows regardless it doesn't matter. I did add some tests
that show where wine behavior is wrong with regard to this. Adding a
check for SE_TCB_NAME won't be hard, and boils down doing a check for
SE_TCB_PRIVILEGE in wineserver, and then only enumerating the local
desktop handle there, and for better security also disallow sending
messages across processes that have different winstations and don't

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