If an injunction is granted by the court, this is a legal remedy which can stop you as an employee from working. It can cause you to lose your ability to be employed in violation of the covenant not to compete for whatever period of time the court sets. This can last for months or years until the court reaches a resolution of the final decision on whether the covenant not to compete which the employee signed is actually enforceable or not. Of course, practically speaking, most employees can't wait months or years without the ability to earn a living, so the T.R.O. hearing is effectively the trial in most cases.