get the current selected text globally

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C

Win32

For my open-source project (written in c and w32) i want to look up the current selected text in a dictionary database,

The application runs fine under linux because there is something like a second clipboard with the current selected text and an event for owerchange of this clipboard.
Under mac and windows I use atm the normal clipboard and
until now i couldn't find something similar like the linux x serves 2. clipboard.

Does anybody know some hack or something how to do a similar thing?

thx in advance!