Memory Manager in early version of Windows tried to load binaries in the same location in the linear address pace each time they are loaded. The /BASE linker option allows the developer to specify a preferred address for a DLL or executable. The preferred address is stored in the header of the binary. If preferred address is not specified, the default load address for executable is 0x400000 and for DLL is 0x10000000. If the address is in used, system will relocate the binary to another region. /FIXED linker address will prevent relocation and causes an error message to be issued instead.
ASLR allows the binaries to be loaded in random addresses. It is enabled with the /DYNAMICBASE linker option. Common DLL will still be shared by multiple address spaces that use them.
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