The Network Print Facility ISPF trace is useful for internal debugging only. Using this trace without the support of IBM® service personnel might not be productive. You can use the NPF ISPF trace to trace an ISPF function (add or delete, for example). Information captured can then be displayed in a data set for evaluation and problem resolution.

Follow these steps to implement the NPF ISPF trace:

1. Optional: Create the sequential data set you want to use for tracing with these specifications: sequential organization (PS), a variable block format (VB), a logical record length (LRECL) of 132, and any block size (BLKSIZE).
2. On the NPF Diagnosis Functions panel (EZAPPDGP), specify this data set or enter a data set name that begins with your TSO user ID and the system will allocate one for you. (See Figure 1.)
3. On the same panel, enter a 2 to turn tracing on.
4. After the operation is complete, return to the NPF Diagnosis Functions panel enter a 1 to turn tracing off.
5. IBM service personnel will inspect the trace data set. Information will be available on data input to the operation and data output to the operation. Evaluate the data to ensure the names match, and appropriate fields are filled-in.