C:\test>dir ?.bmp
31/05/2011  14:33           720,054 1.bmp
31/05/2011  14:33           720,054 2.bmp
               2 File(s)      1,440,108 bytes

C:\test>del 1.zip 2.zip 3.zip

C:\test>zip 1.zip 1.bmp
  adding: 1.bmp (160 bytes security) (deflated 100%)

C:\test>zip 2.zip 2.bmp
  adding: 2.bmp (160 bytes security) (deflated 100%)

C:\test>zip 3.zip 1.bmp 2.bmp
  adding: 1.bmp (160 bytes security) (deflated 100%)
  adding: 2.bmp (160 bytes security) (deflated 100%)

C:\test>dir ?.zip
31/05/2011  14:34             2,376 1.zip
31/05/2011  14:35             2,376 2.zip
31/05/2011  14:35             4,730 3.zip