The present invention relates to a foam control composition and to its use in foaming systems. In particular the disclosure teaches an improved transceiver card architecture that allows high density, flexibility and interchangeability of functionality. The apparatus monitors the dosage both before and after it has been added to a carrier substrate. The switch and key is maintained in locked status by action of the locking hole on the cam pin and by action of the plunger when a key is inserted into the head assembly where the plunger becomes inserted in the locking hole of the indexing wheel andor the flank on the cam pin after rotation by the key causing the key and switch to become locked. After a predetermined time, the member for facilitating movement allows the greenhouse to be moved from the first plot of farming land to the second plot of farming land.