KERNEL32 imports in IDA Pro

Hello,

I am currently exploring an executable in IDA Pro 4.5, and stumbled across a load of imported system calls that are labelled KERNEL32_4, KERNEL32_16 and so on.
IDA created two sections called 'Imports from KERNEL32.DLL', one with system calls correctly identified and typed, the other with the bare KERNEL32_XX names and without data types (the only exception being BuildCommDCBAndTimeoutsW).

What are those unidentified(?) system calls? Am i using a too old version of kernel32.ids? From their calling context I guess that they do some network-related stuff, am i missing a specific ids file? Asking google about KERNEL32_XX will only return a WINE resource.

I'm only beginning with reverse engineering / analyzing executables, so there might be an obvious solution to this problem.

TIA