32 bit and 64 bit---- doubt

["nidhi mittal" <nidhimittal19@xxxxxxxxx>]

Hi all
its a very basic ques may be for many of you .but i have this confusion from long that is.
when we say this application is 32 bit application or 64 bit what do we mean by that
 is it processor which is 32 bit or 64 bit
or the OS which is is 32 bit or 64 bit
or what ?

2. Does it have some relation that in windows in C language int size is 2 bytes in linux gcc it is 4 bytes
i mean any relation of word size with it ??
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Thanks & Regards
Nidhi