search() function gets the list of attached packages in the R Search Path.

The default packages in the search path:

>search()

[1] ".GlobalEnv" "package:stats" "package:graphics"
[4] "package:grDevices" "package:utils" "package:datasets"
[7] "package:methods" "Autoloads" "package:base"

Attach BOD to the search path:

>attach(BOD)
>search()

[1] ".GlobalEnv" "BOD" "package:stats"
[4] "package:graphics" "package:grDevices" "package:utils"
[7] "package:datasets" "package:methods" "Autoloads"
[10] "package:base"

To list the full path of the packages:

>searchpath()

[1] ".GlobalEnv"
[2] "BOD"
[3] "C:/Program Files/R/R-2.15.2/library/stats"
[4] "C:/Program Files/R/R-2.15.2/library/graphics"
[5] "C:/Program Files/R/R-2.15.2/library/grDevices"
[6] "C:/Program Files/R/R-2.15.2/library/utils"
[7] "C:/Program Files/R/R-2.15.2/library/datasets"
[8] "C:/Program Files/R/R-2.15.2/library/methods"
[9] "Autoloads"
[10] "C:/PROGRA~1/R/R-215~1.2/library/base"