check this
http://www.dosbox.com/DOSBoxManual.html#BackslashWin

it doesnt say a thing of pressing alt gr + key, only alt and ctrl

what is your dosbox version and where have you got it from?
what is your Operating System (and its language)?
what are your PC specifications?

post content of "DOSBox Status Window" (in Windows: right click on its title bar -> edit)
enclose your dosbox's config file

what is your keyboard layout and language?
what keyb setting do you use?

-0.74 from http://www.bestsoftware4download.com/software … d-rqeabjvs.html
-win7 64bit dutch
-intel core i5 750
nvidia gtx 275
4gb RAM

config file :http://www.filefront.com/16777207/DOSBox%200. … 4%20Options.bat

-keyb layout azerty , dutch
-belgian point

get latest dosbox from www.dosbox.com

have it already ,am using 0.74

but get if from www.dosbox.com and remove the one you have

it uses the same mirror

what is your keyboard here:
http://msdn.microsoft.com/en-us/goglobal/bb964651.aspx

and keyb ... what do you type in dosbox?

keyb be , bnecause i use a belgian( comma)

you mean the keyboard doesn't work properly everywhere or only in C++ ?

in Dosbox,cant work in C++. C++ is the language

Does the #-key work in the DOSBox command prompt?

it works in the black window but not in the tc/blue window. The blue window i get after inserting the proper commands .(noob at work ,not familiarised with the names )

do you understand ?

the thing is that when using keymapper . Im unable to select # . whenever ichoose the key where it is on . I get 3 or " . How can i map it so it chooses # ?

You can't. The mapper remaps physical keys.

so im unable to use # ?that is weird 😁 what can i do than ?btw with the physical key you mean the one i get when i just type it ,like the t when i type t and the one i get when i press shift ,being T ?No alt gr situations ?

map a key to 3
and press shift that key