There's where dCG could help. Create notes with hot links to source code. Selecting the link will automatically open source code to the exact point. Requires Visual Studio 97. It expands the usable range of asm instructions beyond those recognized by PBDos to include all the latest CPUs' instructions.
More features are on the way for next version.
Kodiak supports syntax highlighting and includes 30 pre-configured syntax highlighting schemes. Topics are saved with individual syntax schemes, so you can store code for different languages in one Kodiak file, and each will display and edit with the appropriate syntax highlighting. You can select from several pre-defined syntax highlighting styles or define and save your own ones. The sourcecode is available on the autthor's homepage. One of the advantages of network computing is the ability to share files while you are online.