-a   watch attribute setting
-A   watch attribute testing
-b # background colour
-B # reverse background colour
-c # context lines
-d # display mode (see below)
-e # emphasis colour [mode 1]
-f # foreground colour
-F # reverse foreground colour
-g # font [mode 5] (see below)
-h # screen height
-i   ignore runtime errors
-l # left margin
-o   watch object movement
-O   watch object locating
-p   alter piracy opcode
-q   quiet (disable sound effects)
-r # right margin
-R <path> restricted read/write
-s # random number seed value
-S # transcript width
-t   set Tandy bit
-T   bold typing [modes 2+4+5]
-u # slots for multiple undo
-v   show version information
-w # screen width
-x   expand abbreviations g/x/z
-Z # error checking (see below)
