Not sure if it'll work for CS 1.6 as I've never played it, but it works for most current Source engine games, so I can suggest
VBCT;
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This tool allows you to compile Source .VMF maps while outside of Hammer and without slowing down the computer. It makes compiling a breeze and you can edit maps or use your computer at the same time.
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Again, not sure if it'll work for 1.6 but I use it.