ON 20040331@9:39:12 AM at page:
http://www.piclist.com/techref/microchip/language/cs.htm#38077.4021412037
  [pplane-erols-R86] Says

C2C with SourceBoost has an excellent PIC16xxx simulator with it, which requires no additional hardware, AND has 'plug-in' simulated hardware (like LED's, buttons, even an 8-bit logic analyzer).<BR>
You should be aware that C2C is a subset of Ansi C, with 8 and 16-bit unsigned math only.  However, the assembly output is very easy to follow.<BR>
<BR>
The CCS-C compiler is Ansi-C with extensions for the PIC.  However, it's source-level debugger requires attached PIC hardware to work.