Lines with a semicolon (;) or hash (#) character as the first non whitespace character are interpreted as comments. A comment is treated as a blank line.

Blank lines are ignored.

Each non blank, non comment line is either a command, or part of a command that is split over consecutive non blank lines.

Command lines that end with a comma (,) as the last non whitespace character is continued on the next non blank line.

Commands are case-insensitive, but are conventionally shown in uppercase.

Operands are case-sensitive because they must be matched against case-sensitive symbol names. You can use wildcard characters in operands.