Why am I seeing additional address spaces for my Netmaster SSI that end with a number?

Document ID : KB000059731
Last Modified Date : 30/03/2018
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Introduction:
System shows spawned NMSSI address spaces running under USS control
Question:
Why am I seeing additional address spaces for my Netmaster SSI that end with a number?
Answer:

USS commands can be submitted from NetMaster. For this purpose, some USS commands may require an additional address space spawned with OTX type, such as onetstat.

When an additional address space is spawned, the numeric suffix it receives and the time it remains active on the system are determined by OMVS. NetMaster has no further influence once the USS call has been passed to the system.
If the USS command is issued from an user environment, the additional address space may be removed after 3mn of inactivity.

The MVS command D A,nmssi* display may show something like:

  JOBS     M/S    TS USERS    SYSAS    INITS   ACTIVE/MAX VTAM     OAS 
  00133    00347  00182       00141    00201   00182/00400         00267
 
   NMSSI  NMSSI  SOLVESSI NSW  SO  A=0089   PER=NO   SMC=000                                      
                                   PGN=N/A  DMN=N/A  AFF=NONE
                                   CT=093.930S  ET=67.02.50                                      
                                   WUID=STC76258 USERID=NETM
                                   WKL=STC      SCL=STCTEST  P=1                                      
                                   RGP=N/A      SRVR=NO  QSC=NO
                                   ADDR SPACE ASTE=0BA6E9C0                                      

  DSPNAME=TDB      ASTE=7FB14800                                      
  DSPNAME=SDB      ASTE=7BBF4300                                      
  DSPNAME=DDB      ASTE=7BBF4280                                      
  DSPNAME=DCP      ASTE=7FB14D80

  NMSSI1 STEP1    NMSSI  OWT  AO  A=0024   PER=NO   SMC=000                                      
                                  PGN=N/A  DMN=N/A  AFF=NONE
                                  CT=002.758S  ET=67.00.32                                      
                                  WUID=STC76164 USERID=NETM
                                  WKL=OMVS     SCL=OMVSREG  P=1

Additional Information:
Additional informations can be obtained with SYSPARM UNIXDEBUG=FF
The SSIPARM is set with UNIX=YES.
This behavior is only with Netmaster release up to 12.1.