Using VPLUS: An Introduction to Forms Design (32209-90004)

Brackets, braces or ellipses appearing in syntax or
format statements which must be entered as shown will be
underlined. For example:
LET
var [[ subscript ] ] = value
Output and input/output parameters are underlined. A
notation in the description of each parameter
distinguishes input/output from output parameters. For
example:
CREATE (
parm1 , parm2 , flags , error )
shading Shading represents inverse video on the terminal's
screen. In addition, it is used to emphasize key
portions of an example.
The symbol may be used to indicate a key on the
terminal's keyboard. For example, RETURN indicates the
carriage return key.
CONTROL
char Control characters are indicated by CONTROL followed by
the character. For example, CONTROLY means the user
presses the control key and the character Y
simultaneously.