Use the Open New Source dialog to open another Source window containing a new executable or DLL for the program you are already debugging.
You may find it easier to open a new Source window by expanding components in the Components pane of the Session Control window until you find the compilation unit you want. The Open New Source dialog is useful for opening a source view for a source file when you are unsure of the file name of the executable that was created from that source file.
If you know the name of the source file, turn on the All executables check box and type in the source file name, then select OK.
If you do not know the name of the source file, leave the Source field blank, and turn off the All executables check box. You can then select an executable from the Executable pulldown list. If you want to view only those executables compiled and linked with debug information, turn on the Debugging information only check box.
Once you have chosen an executable, click on OK (or press Enter) and a Source List dialog displays with a list of the compilation units for that executable. From this Source List dialog, select the compilation unit you want to open a Source window for.