The CPP_DBG_PATH environment variable is used to locate debug source files that are not stored in the same path as the executable being debugged. For example, if your debug binary is stored in F:\BUILDS\SANDDUNE\TEST but your source code is stored in F:\SOURCE and F:\SOURCE\INCLUDE, you should set your CPP_DBG_PATH variable as follows:
set CPP_DBG_PATH=F:\SOURCE;F:\SOURCE\INCLUDE
You can set the CPP_DBG_PATH environment variable on both client and server systems.
The search order used to search for source files depends on the settings of other environment variables as well.