LDAP (Active Directory) and user statuses

[ik]

Hello,

I need to write an application (on Linux) that checks with Active Directory
if a user is logged in, and few other details about that user.
The only thing I do not understand, is how can I check if a user has logged
in or not.

Does anyone have any experience with this issue and can shed some light, or
point me to a good documentation on the subject ?

Thanks,
Ido
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