Short: An OS2.0 utility to deal with public screens 

ScreenManager (SM) is a small CLI utility used to open, close or modify
public screens and retrieve information about them. Screens can be opened
with user-selectable colors and DrawInfo's (they determine which color is
used for highlighting). The resolution is also selectable on a wide range.

On the other hand SM can also be used to make a certain screen the system's
default screen, or to change the screen modes of other public screens.
Finally, it is possible to view a list of all currently open screens in the
system and to get informed about resolution and other properties of screens.