Interface to SGS (only in AGI library)

AGS_ACTIV( status )
Initialise SGS

AGS_ASSOC( param, acmode, pname, picid, newzon, status )
Associate a device with AGI and SGS through ADAM

AGS_DEACT( status )
Close down SGS

AGS_DEASS( param, parcan, status )
De-associate a device from AGI and SGS

AGS_NZONE( newzon, status )
Create a new SGS zone from the current picture

AGS_SZONE( pname, coment, picid, status )
Save the current SGS zone in the database