; define high-level colon def list.
macro head name*, label, help {
     local head, body, nl, ll, hl, nfa, hfa, lfa, cfa, pfa
nl:  align 4
     db nlen, name
     nlen = $-nl-1
hl:  align 4
     db hlen, help
     hlen = $-hl-1
     align 4
head:
nfa:	dd nl
hfa:	dd hl
lfa:	dd ll
     link = ll
}