Continuing on the note from the last post, you can find a good recipe
here below for preventing TexNicCenter from opening more than one window, if you open the same tex-document often. Go down to the slightly cryptical heading “Configuring Windows DDE for TxC”.
Go to Folder Options from the Windows Explorer menu, and find TEX-files in the File Types tab. Press “Advanced” for the TEX-files and delete the action that is currently there. If you have no TEX entry, create a new one, and then create a new action. Enter the following into the text boxes:
Application used to perform action:
"C:\Program Files\TeXnicCenter\TEXCNTR.EXE" "%1"
Check the “Use DDE” check box.
Leave “DDE Application Not Running” as blank
There, much better!