callFun                 Call an RStudio API function
getVersion              Return the current version of the RStudio API
hasFun                  Exists/get for RStudio functions
isAvailable             Check if RStudio is running.
previewRd               Preview an Rd topic in the Help pane
sourceMarkers           Display Source Markers
versionInfo             RStudio Version Information
viewer                  View local web content within RStudio
