Auto-install playstore apps

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http://forum.xda-developers.com – When I install a new ROM it starts to install all apps that I have been using with my gmail account previously installed. Super convenient! I got everything back in a short period of time, without the agreement forevery seperated app. I can not imagine a better batch installation. But, sometimes a few fail (or a lot) because I'm also messing with the googleservices for other things right after the clean install. My question is simple, how do I set the play store, my account or whatever again to install all the apps I had already? how I recall that automatic batch again? (sorry for (HowTos)