1 126 waits for wpar u2014 1 126 to be halted the freeze period employed during overlaying files see 208 cannot be used to remove overlaid files because overlaid files typically need to stay in place until wpar u2014 1 126 is completely shut down on the departure side if overlays are removed before wpar u2014 1 126 has un configured devices on the departure side un configure procedures may fail therefore overlays are left in place until a stoppage and wpar u2014 1 126 becomes active as a native wpar on the arrival side during processing associated with a u201c remove overlays u201d block 220 any overlays installed in wpar u2014 1 126 are removed during processing associated with a u201c restart wpar u201d block 222 wpar u2014 1 126 is restarted in the arrival lpar u2014 2 122 finally if during processing associated with block 216 a determination is made as that os u2014 2 132 is not a previous version of os u2014 1 131 or during processing associated with block 222 wpar u2014 1 126 has been restarted control proceeds to an u201c end move wpar u201d block 229 in which process 200 is complete fig4 is a flowchart of one example of an apply overlays process 250 that may implement aspects of the claimed subject matter process 250 corresponds to apply overlays block 208 fig3 of move wpar process 200 fig3 like process 200 in this example process 250 is associated with logic stored on crsm u2014 1 111 fig1 in conjunction with wpar olm 136 fig1 and executed on one or more processors not.