With the descriptions of the procedures and functions the following conventions are used:

Procedure and function names are written with uppercase letters. This is not necessary in the source text.

Parameters are always provided with a type characteristic suffix, in order to mark the type clearly.

Optional parameters are written in square brackets. Either the special behavior when omitting these parameters is described in the text, or that value is taken, which stands with the parameter after an equals sign.

Parameters written with uppercase letters are variable parameters.

Example:

PSET x%, y% [, z%=1]
Here the parameter z can be omitted as value of the pixel. In that case the value 1 for "setting" is taken.