Here are some utility programs used by VPW. The curve fit mainline is 
provided.  Unfortunately, to rebuild it you need access to a licensed
software package.  However, CURVFIT should run on your system on either
Tektronix 4014 terminals (/FT1) or /REGIS terminals.

SWAPXY takes our canonical X-Y data file and swaps X and Y data.

TYPEPAGE displays text between two line numbers in a text file.  It is
used by VPWTOOLBX.

CURVFIT does all kinds of curve fitting.  More to come one day I hope.

CNVDCALXY converts a DECALC dump file into our canonical X-Y format

MAILMSG is used to give VPW a symbol showing how many mail messages
are waiting to be read.