Query Regarding Single Doctype

Will it be OK if two users uses a single page doctype at the same time or will it give a prompt that this form is already modified,etc . I am using this doc to set values to other doctypes. So if two user uses same doctype for the updation at same time, will it work or generate some problem ?

Came to know that it will work perfectly untill and unless any write operation is being performed from any of the user