Debug buttons in uVision2

A while back I found an example on adding buttons to a debug toolbar, to toggle port bits. This was defined in a debug.ini file.

define button "KICK BUTT","PORT3 ^= 0x04"
define button "Toggle EX0 (P3.2)" , "PORT3 ^= 0x04"

1) In what help file | document do I look at for help with this debug script.

2) How would I add a button to set a byte to a hex value at some (HDATA) far address?

Thanks,