A routine library is a number of procedures, functions and types grouped together into a module. Grouping them together makes it easy to include them in a program by means of a simple import instruction.
At the moment, Slim offers a single routine library: Opsys. Libraries for Posix and X-windows will be created as soon as resources permit.
There is also a standard library of routines which is implicitly imported into every module. These routines offer additional operations for the standard types.