example needed urgent : trial soft , limitation use

[ladoo]

there is 2 things am after

1: limitation the software use when programme is launched , an example will be great such as limiting command1_click to be pressed once a day then order package

2: extend limitation buy a file or some sort how do i do it.

3: even when programme restarted limitation still use shown and order page shown or pop-up

4: has to be comparable with all windows


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is there a way to make php script to change user serial online, is it safe
so if user loose there serial, reformat pc with customer number they can get new serial key online.