DUMPUSERDATA

 typedef struct _DUMPUSERDATA {
   ULONG           no_of_variables;
   [[DUMPDATAVAR]]      DumpDataVar[MAX_USER_DUMPS];
 } DUMPUSERDATA;
 
 typedef DUMPUSERDATA *PDUMPUSERDATA;

no_of_variables (ULONG)

Number of data/structures to be collected by the probe. Maximum number of variables that can be collected is 30.