Mankind is not necessary. If I weren't here to perceive it, time wouldn't exist.

I played with it, it is worth to learn. You can always type "cmd" and enter in cmd-mode. You just have to type "exit" to return in PS-mode.

If they just want your source code in case you go out of business, a viable solution is to pay a lawyer to keep your source code, so that it is available if they want to buy it in the future from you (or you heirs). I suggest to charge them for the cost of the lawyer an extra cost for you in the case you have to continue to develop the application, so you periodically have to send a copy of the updated sources to the lawyer. This means that this cost cannot be payed just one time, instead it should be considered as a subscription to a service to keep the source updates always available to the customer.

The real mess comes when you ask to yourself why on the Earth I am entitled to perceive subjectively just that particular human being that was born in those particular circumstances... or even better: the fact that in the whole world existed some very particular circumstances (whatever they were) capable to make "me" feel subjectively "alive". People that realize that this is the real problem may be interested to what I wrote at http://www.iacopovettori.it/laterzaipotesi/eng/ArgumentsProOI.aspx (with some discussions also with professional philosophers).

I thougth it was just a bug. The first patch of the new O.S. will correctly rename it as "Windows 9"