GMGST (1-byte character string)

Flag indicating whether message retrieved is in a group.

It has one of the following values:

GSNIG

Message is not in a group.

GSMIG

Message is in a group, but is not the last in the group.

GSLMIG

Message is the last in the group.

This is also the value returned if the group consists of only one message.

This is an output field. The initial value of this field is GSNIG. This field is ignored if GMVER is less than GMVER2.