A button consists of a name, of up to 8 characters, and a command which may contain up to 80 characters. The command string may contain several operations which will be executed in sequence. Multi-operations should be separated by the pipe "|" character.
e.g. a button set to the command string:
Calculates the counts within a circle, of radius 0.1 axis units, about the centre of a source selected by the user. This system makes the writing of trivial ICL procedures unnecessary.ICENTROID|IMODE KEY|ICIRCLE RAD=0.1 \|ISTATS|IWHOLE|IMODE CUR