How to change screen resolution in oracle developer in runtime?

My monitor screen resoluion is 1024 x 768 .I want to chage my monitor screen resolution into 800 x 600

oracle developer forms 6i in runtime.How to change screen resolution in oracle developer in runtime?
it is impossible to change the resolution of oracle forms in the run time the only way to that is to open all the forms with the developer ina machine with the 800 x 600 resolution and compile and make them again.

u can use also oracle project builder for this task.