INT 2F - AVATAR.SYS - SET DRIVER STATE AX = 1A21h (AL='!') DS:SI -> command string with one or more state characters (see #02736) CX = length of command string Return: CF set on error (invalid subfunction) CF clear if successful Note: the characters in the state string are interpreted left to right, and need not be in any particular order SeeAlso: AX=1A00h/BX=4156h,AX=1A3Fh