TITLE( interactive @@ Is R running interactively ? )
USAGE(
interactive()
)
ALIAS(interactive)
VALUE(
This function returns LANG(TRUE) when R is being used interactively
and LANG(FALSE) when not. 
)
SEEALSO(
LANG(LINK(source))
)
EXAMPLES(
.First <- function() if(interactive()) x11()
)
