[ovigo22]

How can one check that window manager is running?

[Jackil]

why is it important whether a window manager is running?

[ovigo22]

Jackil, would determine if the app runs a pygtk interface or, a curses interface

[Jackil]

ovigo22, no, won't work. there might be wm running, but the user uses the console. or he prefers to use plain X11 without a wm (ok, improbable)
or the programs run a different computer than the x-server
*run on a*

[ovigo22]

Ok, understood