All lines beginning with ';' or '#' (optionally prefixed with any number of tabs and spaces) are considered remarks and thus ignored; it is possible to add remarks between the two parts of a broken line:

PRINT ABS(DIV(MUL(PIGRECO, 25), \
      ; Remarks are allowed between a broken line
              MUL(CX, ABS(CY)))

By using the character '#' (on operating systems that allow this behaviour), you can run directly the script file by specifying the interpreter, in this way:

#!/usr/bin/proteus [parameters]

The interpreter is run on the file and, since the line begins with '#', it is ignored during execution.

Since a few operating systems discard all characters after the first 32 in the line beginning with #! (and a few parameters might be ignored in this way), Proteus interpret all the parameters every time that a line of this format is detected in the source code. Thus only the essential flags should be specified in the first line; other flags can be added in a following line, in this way:

#!/usr/bin/proteus [most important flags]
; The parameters in the following line are not passed on the command
; line, but interpreted during compilation
;!proteus [other parameters]

This is useful even when the operating system allows for a single parameter on the line #! (even though many flags can be chained in a single parameter).