|OS/2 API Research book, written in Russian (cyrillic), is available from Hobbes:
Now it\'s version 4.4.4, released at 2012-12-12 :-)
This is the complete reference and tutorial for Control Program and Presentation Manager programming. Alongside with CP/PM API, this book describes modern Warp 4.5 Addendum API, eToolkit / libKVA / LANGE API and low-level DDK functions. Moreover, it shows possible roadmap of OS/2 development towards functional programming and microkernel architecture.
Latest changes: more about Rexx language (generic calculations, higher-order functions, macro commands), more about microkernels (such as L4 from the University of Karlsruhe).
The book is distributed in two file formats: INF (the original OS/2 e-book file format) and FictionBook2 (plain XML with embedded pictures).