The picture below shows a screen capture from the MPLAB screen that has a GCB generated file. The Basic command lines show up as comments in green. The assembly code shows up below it.
does is make it a great tool for not only programming PICs in BASIC, but also a great tool for learning assembly code. You can write the BASIC command then see the assembly code directly associated with it. This is something I haven't found that works this easy with any other compiler I've used. Not PICBASIC, not HI-TECH C, or any others. So if you want to learn assembly code or at least understand what each BASIC command is doing then I suggest you try out GCB. After all, it's open source and completely free.