Window launches multiple times (and does not close on lost focus)

[Tethik]

I press my launch-key combination multiple times, for each time I do launchy will start. The application should ideally be a bit smarter and not open new windows when one is already open.

[Tethik]

One way I found other apps do this is by opening a unix socket in a tmp directory. The launching process can then inform the already existing process of the URL/directory that the new process wants to open.

Chromium example:
https://github.com/ChromiumWebApps/chromium/blob/master/chrome/browser/process_singleton_linux.cc