[PAUSE] Make sure you have an edit window open and that the image has mask covering the area whose edge you want to highlight, then click OK, else CANCEL.
FILE:ALPHA-SAVE FILENAME="temp.msk" TYPE=TGA COMPRESS=NO
MASK:BUILD
[ECHO] Set filter Size to number of pixels for edge width
[DIALOG] FILTER:BLUR
APPLY:TRANSPARENCY TRANS=255
EDIT:APPLY-FULL
[ECHO] Set CONtrast slider to 75, click OK
[DIALOG] EFX:IMAGE-CONTROL
EDIT:APPLY-FULL
MASK:INVERT
FILE:ALPHA-INTERSECT FILENAME="temp.msk"
MASK:USE
[ECHO]  Set BRIghtness slider to 90, click OK
[DIALOG] EFX:IMAGE-CONTROL
EDIT:APPLY-FULL