Apple Push Notifications is service launched with iOS 3.0. It uses open IP socket allowing servers send instantly payload to mobile devices like iPhone or iPad. This solution has great advantage over pull approach because there is possibility to send message from application server to client with few bits of network traffic instead of overloading network with periodic queries. There are all snippets of code needed to quickstart with this technology. There are places in documentation where one can wonder how to do something, esspecialy how to handle tokens. Here the code comes:

There were two impressions to be strict :) Many salesmen and IT specialists convince to buy VMware ESXi5. ESXi is “bare metal hypervisor”computer virtualisation product made by VMware company which was acquired by EMC some time ago. It doesn’t require operating system to be installed because it acts like OS and hypervisor merged together.

So my first time. Somebody said that if I had not free server machine I could install ESXi on common hardware and test it. OK. I thought it is not harm to take older, strong computer. ESXi installation was easy but at the end it appeared that there were no drivers to quite popular hardware so I gave up. There is no way to use it without brand server