TCC (Take Command Console) is the new name for 4NT, which is now free in its basic (LE) version. I used 4NT for years, and it's a great console replacement for CMD, but until now it wasn't free.
See home page at http://jpsoft.com/tccledes.htm
and the direct download link is at http://jpsoft.com/downloads/v9/tccle.exe
To install, I ran the exe installer, then copied all files and uninstalled it.
By default it writes its settings to C:\Documents and Settings\<user>\Local Settings\Application Data\JPSoft\TCMD.INI, but copying this file to the application's directory made it use the local copy exclusively.
I tested with procmon, and couldn't find any other reason to suspect it's not portable.

--ts

That this great app is now free is great news. I was a registered 4DOS user back in the day... I hope it is as portable as you think; I'm just not capable of making the determination. But, I'm putting it on my one remaining Win desktop anyway!

This really brought back some fond memories, a really great find. Now if I can only find what I did with my old btm files....

TCC/LE is still free and is now at v13.04, with installers for 32 & 64 bits Windows. IMHO, the best Windows console replacement (cmd.exe); extract and make portable by creating an empty 'TCMD.INI' in program folder...

http://jpsoft.com/tccle-cmd-replacement.html