When this extension is enabled (it is by default), the Irie Pascal compiler will recognized a number of non-standard constants, which are not part of Standard Pascal (i.e. ISO/IEC 7185). NOTE: ISO/IEC 7185 is the standard for the Pascal porgramming language published by the Internation Organization for Standardization.
See the Irie Pascal Programmer's Reference Manual (in "progref.html") for a complete list of non-standard constants.