In this section:
This format code takes one character string argument and lays out the string in a field of N characters. The string is redrawn each time the window is renewed. For this reason, the size N must be specified and must be the maximum number of characters required. The number of lines m is optional and defaults to 1. For example, %20.2st provides for 20 characters on each of two lines. Use the WINDOW_UPDATE@ function (see Updating windows) in order to force a change to become visible. %st (String) is similar to %`rs.