DLH (Dirty Little Helper) was an offline, bi-lingual FAQ, cheat and trainer database application. It was the successor of DLH'98 for DOS. It contains cheats/FAQs/walkthroughs for games on PC, XBOX, GC, PSX, PS2, N64, SNES, NES, GB, DC, Saturn!

More about it on the archive.org page, as the original dhl.net domain is now home to some news website.