The basic structure of the steering card is equivalent to that of most Monte Carlo generators. The steering card consists of several banks, labeled by a character string of four characters. The number of banks in a steering card is not limited.
Each bank consists of an unique four character label, an integer version number and any number of entries (including none).
An entry consists of an identifier and the value of the field. The value can be of type integer, real or string, where string stands for a character constant of arbitrary length.
Comments can be marked by an asterisk (*) in the first column or by an exclamation mark (!) anywhere in a line. If a comment mark is found the rest of the line is ignored.