Siemens SINUMERIK Commissioning Manual page 698

Install software and updates
3.3 How to install and authorize SIMATIC STEP 7
58
The following entries are made automatically in F:\Add_on\oemframe.ini:
[s7tgtopx]
; with HMI Advanced: eliminate minimize/maximize buttons
; of the Step7 window
WindowStyle_Off=196608
; with HMI Advanced: switch to previous task when Step7 is
terminated
nSwitchToTaskAfterTermination= -2
These entries may also need to be modified in OEM configurations.
Commissioning Manual, 03/2009, 6FC5397-1DP10-4BA0
PCU-Basesoftware (IM8)