.he 'SUBSCR''Page %'
.fo 'Steven Hardy'- % -'October 1977'
SUBSCR	It is this function which the system uses to access strips;
so if the value of the variable S is a strip then
 	: S(4) =>
.br
is equivalent to
 	: SUBSCR(4, S) =>
.br
Try the following:
 	: {A B C D} -> S;
 	: S =>
 	: "FOO" -> S(3);
 	: S =>
 	: S(2) =>
 	: 2 -> S(2);
 	: S =>
 	: S(2) + 1 -> S(3);
 	: S(3) =>
 	: S =>
.br
If you have an upper case only terminal you will not have keys
for the characters "{" and "}";
instead type "\\(" and "\\)".
.br
See INIT
