[OpendTect_Developers] about OD function using in CRTMainStartup routine

[自己]

Hi all,
        I am debugging OD myself, In microsoft's windows OS, i found some functions ,such as "const char* GetEnvVar( const char* env )", which were used before main function, actually in function mainCRTStartup. I want to know what OD do that some functions like  "GetEnvVar" were called in the function mainCRTStartup. 
        Best regards for all of you.
                                                                          yan gaohan
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