Question about the initial guess in G98

[wxin <wxinnju #*at*# sina.com>]

Dear ccl-listers,
 In program Gaussian98 one can use the converged wavefunction of one basis set as
 the initial guess wavefunction for another basis set. Who can tell me in detail
 that how the Gaussian program handle these wavefunctions expanded by different
 basis sets, that is how to use one wavefunction of one basis set as
 the initial guess for the wavefunction of another basis set.
        Thanks!
            Xin Wang
                Institute of Theoretical and Computational Chemistry
                College of Chemistry and Chemical Engineering
                Nanjing University
                Nanjing, 210093
                P. R. China