Client Edge has some technical information on the windows used by the DP4 terminal manager. This may be of interest to programmers who wish to subclass the windows created by DP4 programs.
Coordinate system tells you how you can control the settings that determine the size of DP4 user interface components
Default font tells you how to configure the font used for programs using the DP4 terminal manager.
Default Window Size and Position describes how DP4 positions applications on the screen when no explicit position is specified in the configuration file.
Diagnostics tells you how to enable error logging for DP4 programs as an aid to problem diagnosis.
Non client area documents a change made to the DP4 user interface in Windows in 4.616.
Printing tells you how to use the DFPRINT program to take full advantage of the facilities available with Windows printer driver.
Secure Operation of DP4 tells you how to prevent malicious users from making use of DP4 to gain unauthorised access to a computer or its files.