From C, how do I know the screen is locked?

[Rui Miguel Silva Seabra]

Hi,

Can anyone help with a way to check, in C, wether the screen is locked
or not?

Thanks,
Rui

-- 
Grudnuk demand sustenance!
Today is Prickle-Prickle, the 45th day of Bureaucracy in the YOLD 3174
+ No matter how much you do, you never do enough -- unknown
+ Whatever you do will be insignificant,
| but it is very important that you do it -- Gandhi
+ So let's do it...?