When developing mobile devices CFML Code, this must produce XHTML Mobi

lse123

book Vol.1-Getting Started CF8 Forta - ch.17 debugging Q
p.423:fig.17.6:when debugging enabled the debugging info appears in a new popup window along the main webpage output window ?
p.425:samely in this page fig17.7 the append happen in a new popup window along the main webpage output window ?

general CF Q:
I am redevelop a PHP site[poliscarhire.com] with new domain to CFML Code[poliscarhire.eu], well I want to build along with normal Site and a mobile site[poliscarhire.mobi], this may host on the same hosting ?

When developing mobile devices CFML Code, this must produce XHTML Mobile Profile (XHTML MP) Code and not Normal XHTML?
correct / uncorrect ?
Is common practice in this case, to provide the visitor with a menu to choose resolution of his device(how and which choices to provide?)?
How I make canvas(size of each page) mobile/pda size, I must do a main table with this size[eg 240x320]?
Is it good to program for XHTML MP 1.2 DTD, is it supported by old devices [2005-2008]?