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Now it can be called from places other than Pageant's WinMain(). In particular, the attempt to make a security descriptor in lock_interprocess_mutex() is gated on it. In return, however, I've tightened up the semantics. In normal PuTTY builds that aren't trying to support pre-NT systems, the function *unconditionally* returns true, on the grounds that we don't expect to target any system that doesn't support the security APIs, and if someone manages to contrive one anyway - or, more likely, if we some day introduce a bug in our loading of the security API functions - then this safety catch should make Pageant less likely to accidentally fall back to 'never mind, just run in insecure mode'.