The  Windows Telephony Service Provider Interface (TSPI) specification
is  supplied  as  11  separate  files  since it would be too big to be
conveniently manipulated as a single file.  The original files are all
Word for Windows document files; these files are PostScript suitable
for viewing or printing. The files (in correct order) are as follows:

sptitle.ps    title page
spcont.ps     table of contents
spintro.ps    introduction
spover.ps     overview
splinefn.ps   line-related functions (part 1 of chapter)
spphonfn.ps   phone-related functions (part 2 of chapter)
splinems.ps   line-related messages (part 1 of chapter)
spphonms.ps   phone-related messages (part 2 of chapter)
spdata.ps     TSPI-specific data structures (part 1 of chapter)
splineda.ps   line-related data structures (part 2 of chapter)
spphonda.ps   phone-related data structures (part 3 of chapter)
