This procedure draws a scroll bar with the properties specified in SCRBAR.
SCRBAR must be defined as described here:

CONST scrbar=(<position>, <x>, <y>, <y2>, <amount of entries>, <entries per site>, <flags>, 0, 0)

<position> specifies the element at the top of the list.
<flags> specifies details for drawing:

flag	meaning
0x0001	Up button shaded
0x0002	Down button shaded
0x0004	the buttons are evaluated by SBTOUCH
0x0008	the surrounding box is not drawn

The last two elements are required by GUI_SCR and GUI_QSCR! for internal use and must exist.

SBDRAW and SBTOUCH replace the OSL functions GUI_SCR and GUI_QSCR!() and are totally compatible with them.