The first 3 months of your term with the host company are considered a probation period and you may not apply for any advancement or change of position. After 3 months you may apply for a change of position provided you meet the minimum requirements of the position you would like to apply for. These positions are usually advertised internally at the company. When you apply for the new position, the employer will usually ask for an additional 6 month commitment and will usually ask for a reference stating that you have not been late, absent or received any warnings for any reason from your current manager.