Hi,
Just look at the .INFO file, it has a "section" for each CONFIG you can possibly set for the device, choose one from each section if you don't know the default, like:
Code:
; This is for the 18F26K20
#CONFIG
  CONFIG FOSC = HSPLL
  CONFIG FCMEM = ON
  CONFIG IESO = OFF
  CONFIG PWRT = ON
  CONFIG BOREN = OFF
  ; And so on
#ENDCONFIG
That way you don't have to know which bit belongs to which register.

Otherwise you have to resort to the datasheet and/or the .inc file for the device located in the MPASM directory, at the bottom of that file you'll find which bit goes where, like:
Code:
;----- CONFIG1H Options --------------------------------------------------
_FOSC_LP_1H          EQU  H'F0'    ; LP oscillator
_FOSC_XT_1H          EQU  H'F1'    ; XT oscillator
_FOSC_HS_1H          EQU  H'F2'    ; HS oscillator
_FOSC_RC_1H          EQU  H'F3'    ; External RC oscillator, CLKOUT function on RA6
_FOSC_EC_1H          EQU  H'F4'    ; EC oscillator, CLKOUT function on RA6
_FOSC_ECIO6_1H       EQU  H'F5'    ; EC oscillator, port function on RA6
_FOSC_HSPLL_1H       EQU  H'F6'    ; HS oscillator, PLL enabled (Clock Frequency = 4 x FOSC1)
_FOSC_RCIO6_1H       EQU  H'F7'    ; External RC oscillator, port function on RA6
_FOSC_INTIO67_1H     EQU  H'F8'    ; Internal oscillator block, port function on RA6 and RA7
_FOSC_INTIO7_1H      EQU  H'F9'    ; Internal oscillator block, CLKOUT function on RA6, port function on RA7
_FCMEN_OFF_1H        EQU  H'BF'    ; Fail-Safe Clock Monitor disabled
_FCMEN_ON_1H         EQU  H'FF'    ; Fail-Safe Clock Monitor enabled
_IESO_OFF_1H         EQU  H'7F'    ; Oscillator Switchover mode disabled
_IESO_ON_1H          EQU  H'FF'    ; Oscillator Switchover mode enabled


;----- CONFIG2L Options --------------------------------------------------
_PWRT_ON_2L          EQU  H'FE'    ; PWRT enabled
_PWRT_OFF_2L         EQU  H'FF'    ; PWRT disabled
_BOREN_OFF_2L        EQU  H'F9'    ; Brown-out Reset disabled in hardware and software
_BOREN_ON_2L         EQU  H'FB'    ; Brown-out Reset enabled and controlled by software (SBOREN is enabled)
_BOREN_NOSLP_2L      EQU  H'FD'    ; Brown-out Reset enabled in hardware only and disabled in Sleep mode (SBOREN is disabled)
_BOREN_SBORDIS_2L    EQU  H'FF'    ; Brown-out Reset enabled in hardware only (SBOREN is disabled)
_BORV_30_2L          EQU  H'E7'    ; VBOR set to 3.0 V nominal
_BORV_27_2L          EQU  H'EF'    ; VBOR set to 2.7 V nominal
_BORV_22_2L          EQU  H'F7'    ; VBOR set to 2.2 V nominal
_BORV_18_2L          EQU  H'FF'    ; VBOR set to 1.8 V nominal
And so on but again, I prefer the new way posted above.

/Henrik.