You should install an OAS 10g with Forms and Reports Services in order to run your forms from another PC, in this case this would be your deployment environment.
Or if you just want to keep testing your form just do the following while you keep your OCJ4 instance running:
When I try to run my form from another PC through below link as u mentioned in your second point without OAS installed. It does not show anything.
What should i do now?
In the below link
where ip can be replaced by host name i.e., name of the computer where you installed Oracle and port you have given or use default port id (9001)
Ensure that the TNS is configured correctly.
I think the below discussion will help you to fix the error
Ensure you have your firewall turned off, also your OC4J instance must be running.
Which browser are you using in the remote machine ??
Do you have a jre installed in the remote machine ??