Effects of VTAM HALT commands on the NPF VTAM capture point

When a console operator enters a HALT command to end VTAM®, the effect to the NPF VTAM capture point application depends on the type of HALT.

A standard HALT causes the orderly closing of the ACBs for all logical printers, but the Network Print Facility continues.
No new sessions are allowed to start, but existing sessions are allowed to continue normally. After a logical printer's sessions have ended naturally, the logical printer's ACB is closed. The Network Print Facility application remains operational, periodically attempting to reopen the ACBs for its logical printers.
A HALT QUICK causes processing essentially identical to that for the standard HALT, except that each existing session is ended immediately via a TERMSESS macro.
A HALT CANCEL causes the immediate closing of each logical printer's ACB, automatically ending any existing sessions. Data already received is processed. The then ends by returning to MVS™.