Server/clients connection periodically ask for a file

Good afternoon. I'm trying to build an interface where the server can periodically (eg, 1 time a day) to communicate with clients and ask them to return a file (namely CkeckSum). can someone help me because I am not guru in java
the workflow goes like that
1. The server communicates with the clients 1 time per day
2. checks if server's checksum file is the same with clients' checksum
3a. if yes ok
3b if no then runs another programm.

Thanks in advance

If the server is run on Windows then you could setup a Schedule Task to run once a day - How To Schedule Tasks in Windows XP

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