MAPWIN, written by Richard Smith (president of Phar Lap

Software), is a program that makes it easy to see what API functions

a Windows program uses, or what functions a dynamic-link library

(DLL) or device driver provides. Phar Lap generally uses this

utility to determine what API functions need to be implemented in

order to run a program under its 286|DOS-Extender environment. You

can use it to snoop around inside Windows, and uncover useful

undocumented API functions.