Finds the location of the vignette HowToPLW and optionally opens it.
Usage
HowToPLW(view=TRUE)
Arguments
view
logical, should the document be opened using the default PDF document reader?
Value
Details
If the operating system is other than Windows, then the PDF viewer used is that given by Sys.getenv("R_PDFVIEWER").
The PDF viewer can be changed using Sys.putenv(R_PDFVIEWER=).
This function is used by drop-down Vignettes menu when the Rgui interface for Windows is used.