The NPF VTAM® capture point optionally writes debugging information to the SNAP DD. Do not use this DD card unless requested by IBM® service. The //EZAPPSNP DD can use SYSOUT=* or a QSAM data set with VBA or FBA format, a logical record length (LRECL) of 133, and any blocksize.

The SNAP file is specified with the //EZAPPSNP DD statement in the JCL to start the capture point. The SNAP file cannot be shared; therefore, you must specify a unique SNAP file for each startup procedure. If the //EZAPPSNP statement is missing, the system does not perform the debug SNAP trace.