Even though programs are normally written to run under a specific operating system, &os2; has built-in support to be able to execute programs for other operating systems too. &os2; supports the following session types:
PM programs always run in the one and only PM session that is started when the system starts up. You cannot start a second PM session. However, you can extend your screen space with the use of the &pgr;, which allows you to switch between several virtual desktops.
.CMD
extension), will be started in a separate
session that can either be a windowed or full-screen.
Windowed command prompts are visible on
your Desktop as well as if they were part of the PM session, so you can
still see all other windows that are open.
By contrast, an full-screen session
will occupy the entire screen. Your other windows are still open and the
other programs keep running, but in order to see them, you have to switch
back to the PM session using the
Alt+Esc
or Ctrl+Esc
system hotkeys.
.BAT
extension),
usually run in text-mode and can run windowed or full-screen as well.