There are three IDL utility programs which access the archive tapes. An IDL procedure called MKTAP to create archive tapes, another procedure called RDTAP to read any of the various sections or parts of sections of the tape (see Figure), and finally a robust procedure called YOHKOH_SW to read and restore just the software archive files. The YOHKOH_SW procedure is very useful and is recommended for creating a software environment which would be quite similar to the ISAS computing environment. Documentation for RDTAP and MKTAP are given below and the 'yohkoh_sw' documentation can be found in separate guide which is attached to this users guide.