1. 0 2.0

Notifies the pen system that the application edit controls should be replaced with hedit controls. This function is required only for applications that specify EDIT class (instead of HEDIT class) for control windows with versions of Windows earlier than Windows 95.

Note that this function has been superseded by the SetPenAppFlags function in the 2.0 version of the Pen API, although calling RegisterPenApp is still supported. See SetPenAppFlags for more information.