How to start a new visit?

I read General - Analytics Platform - Matomo . But this not fit for me. I want to use piwik tracking with my desktop app. So I always know when visit in really was started and ended.

Is there a way to write on piwik server certain time of start and end my app?

Yes use the parameter &cdt to specify the time of an action, see: http://piwik.org/docs/tracking-api/reference/

I don’t want to make a new user on piwik server. Can I use some fake token_auth?

no

I tried to use cdt but new visit was not started.
I start my app, exit, and start again. When I opened piwik site->Visitors->Visitor log I see only one visit.


http://my-site.com/piwik/piwik.php?action_name=Start&apiv=1&cdt=2013-02-20%2011%3a43%3a00&h=17&idsite=2&m=43&rec=1&res=1920x1080&s=0&token_auth=xxxxxxxxxxxxxxxxxxxx&url=http%3a%2f%2fapp.com%2f

Maybe I something do wrong?