1). For this I should ask you another question - why doesn't php tags <?php ?> work in asp?
Whether it is asp, jsp, php, coldfusion , perl or any other scripting langauge, each has these langauges (their interpreter or processing module or scripting engine) has their own way to identify their scripts.
2). Please check the mac documentation for this. iPad is restrictive on what can be installed on it.
3). There are plenty on the web, please google it. Here is one such link:http://phillipnb.wordpress.com/2012/06/ ... questions/