.BG
.FN macro
.TL
Old-S Macro Processor (Obsolete)
.CS
macro(arg)
.AG arg
character string that invokes an old-S macro.
.SE
The character string is run through the macro processor and its
output is given as the input to the `source' function.
.EX
macro("?foo(bar)")   # invoke old macro foo
.WR
