Gotcha! is a small (well not so small anymore ;-) utility for OS/2 which allows to easily capture windows, window interiors, parts of the screen or the whole desktop and save them to disk or clipboard as a picture (in several file formats if OS/2 Multimedia is installed; otherwise only BMP format).
http://www.c2226.de/programs/gotcha/
http://hobbes.nmsu.edu/cgi-bin/h-search?key=gotch178.zip
Source: OS2.jp
Note: Starting with v1.73 Gotcha! is free software under the GPL.