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                            emm_getsetpagemap

   Usage
   #include <emm.h>
   void emm_getsetpagemap(void *dst, void *src);

   Description
   This routine requests the Expanded Memory Manager to store the current
   page  mapping  context, into the buffer dst supplied  by  the  calling
   function  and  then to set the mapping context using  the  new  values
   provided  in  the  buffer  src. This is the  equivalent  of  doing  an
   emm_getpagemap(dst) followed by an emm_setpagemap(src). No EMM  handle
   is required (unlike emm_savepagemap). The size of the buffer needed to
   store this information can be obtained from emm_getpagemapsize.