This help topic is for R version 2.9.0. For the current version of R, try https://stat.ethz.ch/R-manual/R-patched/library/grid/html/grid-internal.html
grid-internal {grid}R Documentation

Internal Grid Functions

Description

Internal Grid functions

Details

These are not to be called by the user (or in some cases are just waiting for proper documentation to be written :).

[Package grid version 2.9.0 ]