h6. [[Programmer's Reference Manuals]] h6(. » [[VDU Codes]] h6((. » VDU 28 h2. VDU 28 (&1C) h4. Use Enables definition of text window, i.e. area of screen to which future text is written (rather than being written anywhere on the screen). h4. Syntax VDU 28,__lx__;__by__;__rx__;__ty__; h4. Parameters |<^{width:8em}. _lx_|<^. Left X| |<^. _by_|<^. Bottom Y| |<^. _rx_|<^. Right X| |<^. _ty_|<^. Top Y| h4. Notes Four coordinates are given as character positions, with the origin being 0,0 at the top left of the screen. Maximum values depend on the current screen mode. h4. See also * [[VDU 23|VDU 23]] * [[VDU 31|VDU 31]]