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dfEnvSub()
Sets a DOS environment variable
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Syntax:

     dfEnvSub( <cStr> ) --> cSubstituted

Parameters:

     <cStr>     Input string

Returns:

     <cSubstituted> Replaced string

Description:

     Replaces the contents of an environment variable, specified between a
     pair of '%', with the specified string

Example:

     //
     // Suppose the following variable has been set:
     //
     // SET TEMP=C:\DBSEE4\BIN
     //
     
     dfEnvSub( "MyEnv%dbsee.hlp" )
             // MyEnvdbsee.hlp
     dfEnvSub( "%temp%dbsee.hlp" )
             // C:\DBSEE4\BIN\dbsee.hlp
     dfEnvSub( "%stemp%dbsee.hlp" )
             // dbsee.hlp

See also:

     dfPathChk()