NET_CALLOUTS

   NET_CALLOUTS is normally set to 0. A value of 255 indicates that
   no attempt is to be made to assign a new proxy connection to an
   active server, but that a new process must be started to invoke
   the installation security policy callout modules in LOGINOUT.EXE.
   Values 1 through 254 are reserved for future use.

   NET_CALLOUTS is a DYNAMIC parameter.