Obscure features of GPC

[J Blakeney]

Does anyone know how to access "ellipsis" parameters for that define variable argument lists for precedures on a Pentium linux system.
e.g. Procedure A_Procedure ( a: Integer; ... );

The GNU pascal documentation  says the access method is implementation dependent, but as far as I can see doesn't give any methods [I've tried accessing via pointers and successfully crashed my computer]

Thanks
		John Blakeney